diff --git a/configure.ac b/configure.ac
index 7a048b85..c6b39854 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,498 +1,503 @@
 #
 # Copyright (C) 2010-2021 Red Hat, Inc.  All rights reserved.
 #
 # Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
 #          Federico Simoncelli <fsimon@kronosnet.org>
 #
 # This software licensed under GPL-2.0+
 #
 
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 #
 
 AC_PREREQ([2.63])
 AC_INIT([kronosnet],
 	m4_esyscmd([build-aux/git-version-gen .tarball-version .gitarchivever]),
 	[devel@lists.kronosnet.org])
 # Don't let AC_PROC_CC (invoked by AC_USE_SYSTEM_EXTENSIONS) replace
 # undefined CFLAGS with -g -O2, overriding our special OPT_CFLAGS.
 : ${CFLAGS=""}
 AC_USE_SYSTEM_EXTENSIONS
 AM_INIT_AUTOMAKE([1.13 dist-bzip2 dist-xz color-tests -Wno-portability subdir-objects])
 
 LT_PREREQ([2.2.6])
 # --enable-new-dtags: Use RUNPATH instead of RPATH.
 # It is necessary to have this done before libtool does linker detection.
 # See also: https://github.com/kronosnet/kronosnet/issues/107
 # --as-needed: Modern systems have builtin ceil() making -lm superfluous but
 # AC_SEARCH_LIBS can't detect this because it tests with a false prototype
 AX_CHECK_LINK_FLAG([-Wl,--enable-new-dtags],
 		   [AM_LDFLAGS=-Wl,--enable-new-dtags],
 		   [AC_MSG_ERROR(["Linker support for --enable-new-dtags is required"])])
 AX_CHECK_LINK_FLAG([-Wl,--as-needed], [AM_LDFLAGS="$AM_LDFLAGS -Wl,--as-needed"])
 
 AC_SUBST([AM_LDFLAGS])
 saved_LDFLAGS="$LDFLAGS"
 LDFLAGS="$AM_LDFLAGS $LDFLAGS"
 LT_INIT
 LDFLAGS="$saved_LDFLAGS"
 
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([libknet/handle.c])
 AC_CONFIG_HEADERS([config.h])
 
 AC_CANONICAL_HOST
 
 AC_LANG([C])
 
 if test "$prefix" = "NONE"; then
 	prefix="/usr"
 	if test "$localstatedir" = "\${prefix}/var"; then
 		localstatedir="/var"
 	fi
 	if test "$libdir" = "\${exec_prefix}/lib"; then
 		if test -e /usr/lib64; then
 			libdir="/usr/lib64"
 		else
 			libdir="/usr/lib"
 		fi
 	fi
 fi
 
 AC_PROG_AWK
 AC_PROG_GREP
 AC_PROG_SED
 AC_PROG_CPP
 AC_PROG_CC
 AC_PROG_CC_C99
 if test "x$ac_cv_prog_cc_c99" = "xno"; then
 	AC_MSG_ERROR(["C99 support is required"])
 fi
 AC_PROG_LN_S
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 PKG_PROG_PKG_CONFIG
 
 AC_CHECK_PROGS([VALGRIND_EXEC], [valgrind])
 AM_CONDITIONAL([HAS_VALGRIND], [test x$VALGRIND_EXEC != "x"])
 
 AC_CHECK_PROGS([COVBUILD_EXEC], [cov-build])
 AM_CONDITIONAL([HAS_COVBUILD], [test x$COVBUILD_EXEC != "x"])
 
 AC_CHECK_PROGS([COVANALYZE_EXEC], [cov-analyze])
 AM_CONDITIONAL([HAS_COVANALYZE], [test x$COVANALYZE_EXEC != "x"])
 
 AC_CHECK_PROGS([COVFORMATERRORS_EXEC], [cov-format-errors])
 AM_CONDITIONAL([HAS_COVFORMATERRORS], [test x$COVFORMATERRORS_EXEC != "x"])
 
 # KNET_OPTION_DEFINES(stem,type,detection code)
 # stem: enters name of option, Automake conditional and preprocessor define
 # type: compress or crypto, determines where the default comes from
 AC_DEFUN([KNET_OPTION_DEFINES],[
 AC_ARG_ENABLE([$2-$1],[AS_HELP_STRING([--disable-$2-$1],[disable libknet $1 support])],,
 	[enable_$2_$1="$enable_$2_all"])
 AM_CONDITIONAL([BUILD_]m4_toupper([$2_$1]),[test "x$enable_$2_$1" = xyes])
 if test "x$enable_$2_$1" = xyes; then
 	$3
 fi
 AC_DEFINE_UNQUOTED([WITH_]m4_toupper([$2_$1]), [`test "x$enable_$2_$1" != xyes; echo $?`], $1 $2 [built in])
 ])
 
 AC_ARG_ENABLE([man],
 	[AS_HELP_STRING([--disable-man],[disable man page creation])],,
 	[ enable_man="yes" ])
 AM_CONDITIONAL([BUILD_MAN], [test x$enable_man = xyes])
 
 AC_ARG_ENABLE([libknet-sctp],
 	[AS_HELP_STRING([--disable-libknet-sctp],[disable libknet SCTP support])],,
 	[ enable_libknet_sctp="yes" ])
 AM_CONDITIONAL([BUILD_SCTP], [test x$enable_libknet_sctp = xyes])
 
+AC_ARG_ENABLE([functional-tests],
+	[AS_HELP_STRING([--disable-functional-tests],[disable execution of functional tests, useful for old and slow arches])],,
+	[ enable_functional_tests="yes" ])
+AM_CONDITIONAL([RUN_FUN_TESTS], [test x$enable_functional_tests = xyes])
+
 AC_ARG_ENABLE([crypto-all],
 	[AS_HELP_STRING([--disable-crypto-all],[disable libknet all crypto modules support])],,
 	[ enable_crypto_all="yes" ])
 
 KNET_OPTION_DEFINES([nss],[crypto],[PKG_CHECK_MODULES([nss], [nss])])
 KNET_OPTION_DEFINES([openssl],[crypto],[PKG_CHECK_MODULES([openssl], [libcrypto])])
 
 # use gcry_mac_open to detect if libgcrypt is new enough
 KNET_OPTION_DEFINES([gcrypt],[crypto],[
 	PKG_CHECK_MODULES([gcrypt], [libgcrypt >= 1.8.0],,
 		[AC_CHECK_HEADERS([gcrypt.h],
 			[AC_CHECK_LIB([gcrypt], [gcry_mac_open],
 				[AC_SUBST([gcrypt_LIBS], ["-lgcrypt -ldl -lgpg-error"])])],
 				[AC_MSG_ERROR(["missing required gcrypt.h"])])])
 ])
 
 AC_ARG_ENABLE([compress-all],
 	[AS_HELP_STRING([--disable-compress-all],[disable libknet all compress modules support])],,
 	[ enable_compress_all="yes" ])
 
 KNET_OPTION_DEFINES([zstd],[compress],[PKG_CHECK_MODULES([libzstd], [libzstd])])
 KNET_OPTION_DEFINES([zlib],[compress],[PKG_CHECK_MODULES([zlib], [zlib])])
 KNET_OPTION_DEFINES([lz4],[compress],[PKG_CHECK_MODULES([liblz4], [liblz4])])
 KNET_OPTION_DEFINES([lzo2],[compress],[
 	PKG_CHECK_MODULES([lzo2], [lzo2],
 		[# work around broken pkg-config file in v2.10
 		 AC_SUBST([lzo2_CFLAGS],[`echo $lzo2_CFLAGS | sed 's,/lzo *, ,'`])],
 		[AC_CHECK_HEADERS([lzo/lzo1x.h],
 			[AC_CHECK_LIB([lzo2], [lzo1x_decompress_safe],
 				[AC_SUBST([lzo2_LIBS], [-llzo2])])],
 				[AC_MSG_ERROR(["missing required lzo/lzo1x.h header"])])])
 ])
 KNET_OPTION_DEFINES([lzma],[compress],[PKG_CHECK_MODULES([liblzma], [liblzma])])
 KNET_OPTION_DEFINES([bzip2],[compress],[
 	PKG_CHECK_MODULES([bzip2], [bzip2],,
 		[AC_CHECK_HEADERS([bzlib.h],
 			[AC_CHECK_LIB([bz2], [BZ2_bzBuffToBuffCompress],
 				[AC_SUBST([bzip2_LIBS], [-lbz2])])],
 				[AC_MSG_ERROR(["missing required bzlib.h"])])])
 ])
 
 AC_ARG_ENABLE([install-tests],
 	[AS_HELP_STRING([--enable-install-tests],[install tests])],,
 	[ enable_install_tests="no" ])
 AM_CONDITIONAL([INSTALL_TESTS], [test x$enable_install_tests = xyes])
 
 AC_ARG_ENABLE([runautogen],
 	[AS_HELP_STRING([--enable-runautogen],[run autogen.sh])],,
 	[ enable_runautogen="no" ])
 AM_CONDITIONAL([BUILD_RUNAUTOGEN], [test x$enable_runautogen = xyes])
 
 override_rpm_debuginfo_option="yes"
 AC_ARG_ENABLE([rpm-debuginfo],
 	[AS_HELP_STRING([--enable-rpm-debuginfo],[build debuginfo packages])],,
 	[ enable_rpm_debuginfo="no", override_rpm_debuginfo_option="no" ])
 AM_CONDITIONAL([BUILD_RPM_DEBUGINFO], [test x$enable_rpm_debuginfo = xyes])
 AM_CONDITIONAL([OVERRIDE_RPM_DEBUGINFO], [test x$override_rpm_debuginfo_option = xyes])
 
 AC_ARG_ENABLE([libnozzle],
 	[AS_HELP_STRING([--enable-libnozzle],[libnozzle support])],,
 	[ enable_libnozzle="yes" ])
 AM_CONDITIONAL([BUILD_LIBNOZZLE], [test x$enable_libnozzle = xyes])
 
 AC_ARG_ENABLE([rust-bindings],
 	[AS_HELP_STRING([--enable-rust-bindings],[rust bindings support])],,
 	[ enable_rust_bindings="no" ])
 AM_CONDITIONAL([BUILD_RUST_BINDINGS], [test x$enable_rust_bindings = xyes])
 
 # Checks for libraries.
 AX_PTHREAD(,[AC_MSG_ERROR([POSIX threads support is required])])
 saved_LIBS="$LIBS"
 LIBS=
 AC_SEARCH_LIBS([ceil], [m], , [AC_MSG_ERROR([ceil not found])])
 AC_SUBST([m_LIBS], [$LIBS])
 LIBS=
 AC_SEARCH_LIBS([clock_gettime], [rt], , [AC_MSG_ERROR([clock_gettime not found])])
 AC_SUBST([rt_LIBS], [$LIBS])
 LIBS=
 AC_SEARCH_LIBS([dlopen], [dl dld], , [AC_MSG_ERROR([dlopen not found])])
 AC_SUBST([dl_LIBS], [$LIBS])
 LIBS="$saved_LIBS"
 
 # Check RTLD_DI_ORIGIN (not decalred by musl. glibc has it as an enum so cannot use ifdef)
 AC_CHECK_DECL([RTLD_DI_ORIGIN], [AC_DEFINE([HAVE_RTLD_DI_ORIGIN], 1,
     [define when RTLD_DI_ORIGIN is declared])], ,[[#include <dlfcn.h>]])
 
 # OS detection
 
 AC_MSG_CHECKING([for os in ${host_os}])
 case "$host_os" in
 	*linux*)
 		AC_DEFINE_UNQUOTED([KNET_LINUX], [1], [Compiling for Linux platform])
 		AC_MSG_RESULT([Linux])
 		;;
 	*bsd*)
 		AC_DEFINE_UNQUOTED([KNET_BSD], [1], [Compiling for BSD platform])
 		AC_MSG_RESULT([BSD])
 		;;
 	*)
 		AC_MSG_ERROR([Unsupported OS? hmmmm])
 		;;
 esac
 
 # Checks for header files.
 AC_CHECK_HEADERS([sys/epoll.h])
 AC_CHECK_FUNCS([kevent])
 # if neither sys/epoll.h nor kevent are present, we should fail.
 
 if test "x$ac_cv_header_sys_epoll_h" = xno && test "x$ac_cv_func_kevent" = xno; then
 	AC_MSG_ERROR([Both epoll and kevent unavailable on this OS])
 fi
 
 if test "x$ac_cv_header_sys_epoll_h" = xyes && test "x$ac_cv_func_kevent" = xyes; then
 	AC_MSG_ERROR([Both epoll and kevent available on this OS, please contact the maintainers to fix the code])
 fi
 
 if test "x$enable_libknet_sctp" = xyes; then
 	AC_CHECK_HEADERS([netinet/sctp.h],, [AC_MSG_ERROR(["missing required SCTP headers"])])
 fi
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_TYPE_UINT8_T
 AC_TYPE_UINT16_T
 AC_TYPE_UINT32_T
 AC_TYPE_UINT64_T
 AC_TYPE_INT8_T
 AC_TYPE_INT16_T
 AC_TYPE_INT32_T
 AC_TYPE_INT64_T
 
 PKG_CHECK_MODULES([libqb], [libqb])
 
 if test "x$enable_man" = "xyes"; then
 	AC_ARG_VAR([DOXYGEN], [override doxygen executable])
 	AC_CHECK_PROGS([DOXYGEN], [doxygen], [no])
 	if test "x$DOXYGEN" = xno; then
 		AC_MSG_ERROR(["Doxygen command not found"])
 	fi
 
 	AC_ARG_VAR([DOXYGEN2MAN], [override doxygen2man executable])
 
 	# required to detect doxygen2man when libqb is installed
 	# in non standard paths
 	saved_PKG_CONFIG="$PKG_CONFIG"
 	saved_ac_cv_path_PKG_CONFIG="$ac_cv_path_PKG_CONFIG"
 	unset PKG_CONFIG ac_cv_path_PKG_CONFIG
 	AC_PATH_PROG([PKG_CONFIG], [pkg-config])
 	PKG_CHECK_MODULES([libqb_BUILD], [libqb])
 	PKG_CHECK_VAR([libqb_BUILD_PREFIX], [libqb], [prefix])
 	AC_PATH_PROG([DOXYGEN2MAN], [doxygen2man], [no], [$libqb_BUILD_PREFIX/bin$PATH_SEPARATOR$PATH])
 	PKG_CONFIG="$saved_PKG_CONFIG"
 	ac_cv_path_PKG_CONFIG="$saved_ac_cv_path_PKG_CONFIG"
 
 	if test "x$DOXYGEN2MAN" = "xno"; then
 		AC_MSG_ERROR(["doxygen2man command not found"])
 	fi
 	AC_SUBST([DOXYGEN2MAN])
 fi
 
 # check for rust tools to build bindings
 if test "x$enable_rust_bindings" = "xyes"; then
 	AC_PATH_PROG([CARGO], [cargo], [no])
 	if test "x$CARGO" = xno; then
 		AC_MSG_ERROR(["cargo command not found"])
 	fi
 
 	AC_PATH_PROG([RUSTC], [rustc], [no])
 	if test "x$RUSTC" = xno; then
 		AC_MSG_ERROR(["rustc command not found"])
 	fi
 
 	AC_PATH_PROG([RUSTDOC], [rustdoc], [no])
 	if test "x$RUSTDOC" = xno; then
 		AC_MSG_ERROR(["rustdoc command not found"])
 	fi
 
 	AC_PATH_PROG([BINDGEN], [bindgen], [no])
 	if test "x$BINDGEN" = xno; then
 		AC_MSG_ERROR(["bindgen command not found"])
 	fi
 
 	AC_PATH_PROG([CLIPPY], [clippy-driver], [no])
 	if test "x$CLIPPY" = xno; then
 		AC_MSG_ERROR(["clippy-driver command not found"])
 	fi
 
 	AC_PATH_PROG([RUSTFMT], [rustfmt], [no])
 	if test "x$RUSTFMT" = xno; then
 		AC_MSG_WARN(["rustfmt command not found (optional)"])
 	fi
 fi
 
 # checks for libnozzle
 if test "x$enable_libnozzle" = xyes; then
 	if `echo $host_os | grep -q linux`; then
 		PKG_CHECK_MODULES([libnl], [libnl-3.0])
 		PKG_CHECK_MODULES([libnlroute], [libnl-route-3.0 >= 3.3], [],
 			[PKG_CHECK_MODULES([libnlroute], [libnl-route-3.0 < 3.3],
 					   [AC_DEFINE_UNQUOTED([LIBNL3_WORKAROUND], [1], [Enable libnl < 3.3 build workaround])], [])])
 	fi
 fi
 
 # https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
 knetcurrent="2"
 knetrevision="0"
 knetage="0"
 # c:r:a
 libknetversion="$knetcurrent:$knetrevision:$knetage"
 # soname derived from c:r:a
 # use $VERSION as build info https://semver.org/. build info are incremental automatically
 knetalpha="-alpha1"
 libknetrustver="$(($knetcurrent - $knetage)).$knetage.$knetrevision$knetalpha+$VERSION"
 
 nozzlecurrent="1"
 nozzlerevision="0"
 nozzleage="0"
 libnozzleversion="$nozzlecurrent:$nozzlerevision:$nozzleage"
 # nozzle is stable for now
 nozzlealpha=""
 libnozzlerustver="$(($nozzlecurrent - $nozzleage)).$nozzleage.$nozzlerevision$nozzlealpha+$VERSION"
 
 AC_SUBST([libknetversion])
 AC_SUBST([libknetrustver])
 AC_SUBST([libnozzleversion])
 AC_SUBST([libnozzlerustver])
 
 # local options
 AC_ARG_ENABLE([debug],
 	[AS_HELP_STRING([--enable-debug],[enable debug build])])
 
 AC_ARG_WITH([sanitizers],
 	[AS_HELP_STRING([--with-sanitizers=...,...],
 			[enable SANitizer build, do *NOT* use for production. Only ASAN/UBSAN/TSAN are currently supported])],
 	[ SANITIZERS="$withval" ],
 	[ SANITIZERS="" ])
 
 AC_ARG_WITH([testdir],
 	[AS_HELP_STRING([--with-testdir=DIR],[path to /usr/lib../kronosnet/tests/ dir where to install the test suite])],
 	[ TESTDIR="$withval" ],
 	[ TESTDIR="$libdir/kronosnet/tests" ])
 
 ## do subst
 
 AC_SUBST([TESTDIR])
 
 # debug build stuff
 if test "x${enable_debug}" = xyes; then
 	AC_DEFINE_UNQUOTED([DEBUG], [1], [Compiling Debugging code])
 	OPT_CFLAGS="-O0"
 	RUST_FLAGS=""
 	RUST_TARGET_DIR="debug"
 else
 	OPT_CFLAGS="-O3"
 	RUST_FLAGS="--release"
 	RUST_TARGET_DIR="release"
 fi
 
 # gdb flags
 if test "x${GCC}" = xyes; then
 	GDB_FLAGS="-ggdb3"
 else
 	GDB_FLAGS="-g"
 fi
 
 # --- ASAN/UBSAN/TSAN (see man gcc) ---
 # when using SANitizers, we need to pass the -fsanitize..
 # to both CFLAGS and LDFLAGS. The CFLAGS/LDFLAGS must be
 # specified as first in the list or there will be runtime
 # issues (for example user has to LD_PRELOAD asan for it to work
 # properly).
 
 if test -n "${SANITIZERS}"; then
 	SANITIZERS=$(echo $SANITIZERS | sed -e 's/,/ /g')
 	for SANITIZER in $SANITIZERS; do
 		case $SANITIZER in
 			asan|ASAN)
 				SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=address"
 				SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=address -lasan"
 				AC_CHECK_LIB([asan],[main],,AC_MSG_ERROR([Unable to find libasan]))
 				;;
 			ubsan|UBSAN)
 				SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=undefined"
 				SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=undefined -lubsan"
 				AC_CHECK_LIB([ubsan],[main],,AC_MSG_ERROR([Unable to find libubsan]))
 				;;
 			tsan|TSAN)
 				SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=thread"
 				SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=thread -ltsan"
 				AC_CHECK_LIB([tsan],[main],,AC_MSG_ERROR([Unable to find libtsan]))
 				;;
 		esac
 	done
 fi
 
 DEFAULT_CFLAGS="-Werror -Wall -Wextra"
 
 # manual overrides
 # generates too much noise for stub APIs
 UNWANTED_CFLAGS="-Wno-unused-parameter"
 
 AC_SUBST([AM_CFLAGS],["$SANITIZERS_CFLAGS $OPT_CFLAGS $GDB_FLAGS $DEFAULT_CFLAGS $UNWANTED_CFLAGS"])
 LDFLAGS="$SANITIZERS_LDFLAGS $LDFLAGS"
 AC_SUBST([RUST_FLAGS])
 AC_SUBST([RUST_TARGET_DIR])
 
 AX_PROG_DATE
 AS_IF([test "$ax_cv_prog_date_gnu_date:$ax_cv_prog_date_gnu_utc" = yes:yes],
 	[UTC_DATE_AT="date -u -d@"],
 	[AS_IF([test "x$ax_cv_prog_date_bsd_date" = xyes],
 		[UTC_DATE_AT="date -u -r"],
 		[AC_MSG_ERROR([date utility unable to convert epoch to UTC])])])
 AC_SUBST([UTC_DATE_AT])
 
 AC_ARG_VAR([SOURCE_EPOCH],[last modification date of the source])
 AC_MSG_NOTICE([trying to determine source epoch])
 AC_MSG_CHECKING([for source epoch in \$SOURCE_EPOCH])
 AS_IF([test -n "$SOURCE_EPOCH"],
 	[AC_MSG_RESULT([yes])],
 	[AC_MSG_RESULT([no])
 	 AC_MSG_CHECKING([for source epoch in source_epoch file])
 	 AS_IF([test -e "$srcdir/source_epoch"],
 		[read SOURCE_EPOCH <"$srcdir/source_epoch"
 		 AC_MSG_RESULT([yes])],
 		[AC_MSG_RESULT([no])
 		 AC_MSG_CHECKING([for source epoch baked in by gitattributes export-subst])
 		 SOURCE_EPOCH='$Format:%at$' # template for rewriting by git-archive
 		 AS_CASE([$SOURCE_EPOCH],
 			[?Format:*], # was not rewritten
 				[AC_MSG_RESULT([no])
 				 AC_MSG_CHECKING([for source epoch in \$SOURCE_DATE_EPOCH])
 				 AS_IF([test "x$SOURCE_DATE_EPOCH" != x],
 					[SOURCE_EPOCH="$SOURCE_DATE_EPOCH"
 					 AC_MSG_RESULT([yes])],
 					[AC_MSG_RESULT([no])
 					 AC_MSG_CHECKING([whether git log can provide a source epoch])
 					 SOURCE_EPOCH=f${SOURCE_EPOCH#\$F} # convert into git log --pretty format
 					 SOURCE_EPOCH=$(cd "$srcdir" && git log -1 --pretty=${SOURCE_EPOCH%$} 2>/dev/null)
 					 AS_IF([test -n "$SOURCE_EPOCH"],
 						[AC_MSG_RESULT([yes])],
 						[AC_MSG_RESULT([no, using current time and breaking reproducibility])
 						 SOURCE_EPOCH=$(date +%s)])])],
 			[AC_MSG_RESULT([yes])]
 		 )])
 	])
 AC_MSG_NOTICE([using source epoch $($UTC_DATE_AT$SOURCE_EPOCH +'%F %T %Z')])
 
 AC_CONFIG_FILES([
 		Makefile
 		libnozzle/Makefile
 		libnozzle/libnozzle.pc
 		libnozzle/tests/Makefile
 		libnozzle/bindings/Makefile
 		libnozzle/bindings/rust/Makefile
 		libnozzle/bindings/rust/Cargo.toml
 		libnozzle/bindings/rust/tests/Makefile
 		libnozzle/bindings/rust/tests/Cargo.toml
 		libknet/Makefile
 		libknet/libknet.pc
 		libknet/tests/Makefile
 		libknet/bindings/Makefile
 		libknet/bindings/rust/Makefile
 		libknet/bindings/rust/Cargo.toml
 		libknet/bindings/rust/tests/Makefile
 		libknet/bindings/rust/tests/Cargo.toml
 		man/Makefile
 		man/Doxyfile-knet
 		man/Doxyfile-nozzle
 		])
 
 if test "x$VERSION" = "xUNKNOWN"; then
 	AC_MSG_ERROR([m4_text_wrap([
   configure was unable to determine the source tree's current version. This
   generally happens when using git archive (or the github download button)
   generated tarball/zip file. In order to workaround this issue, either use git
   clone https://github.com/kronosnet/kronosnet.git or use an official release
   tarball, available at https://kronosnet.org/releases/.  Alternatively you
   can add a compatible version in a .tarball-version file at the top of the
   source tree, wipe your autom4te.cache dir and generated configure, and rerun
   autogen.sh.
   ], [  ], [   ], [76])])
 fi
 
 AC_OUTPUT
diff --git a/libknet/tests/Makefile.am b/libknet/tests/Makefile.am
index f2481ab3..1ef71183 100644
--- a/libknet/tests/Makefile.am
+++ b/libknet/tests/Makefile.am
@@ -1,121 +1,126 @@
 #
 # Copyright (C) 2016-2021 Red Hat, Inc.  All rights reserved.
 #
 # Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
 #
 # This software licensed under GPL-2.0+
 #
 
 MAINTAINERCLEANFILES	= Makefile.in
 
 include $(top_srcdir)/build-aux/check.mk
 include $(top_srcdir)/libknet/tests/api-check.mk
 
 EXTRA_DIST		= \
 			  api-test-coverage \
 			  api-check.mk
 
 AM_CPPFLAGS		= -I$(top_srcdir)/libknet
 AM_CFLAGS		+= $(PTHREAD_CFLAGS) $(libqb_CFLAGS)
 LIBS			= $(top_builddir)/libknet/libknet.la \
 			  $(PTHREAD_LIBS) $(dl_LIBS)
 
 noinst_HEADERS		= \
 			  test-common.h
 
 # the order of those tests is NOT random.
 # some functions can only be tested properly after some dependents
 # API have been validated upfront.
 
 check_PROGRAMS		= \
 			  $(api_checks) \
-			  $(int_checks) \
-			  $(fun_checks)
+			  $(int_checks)
+
+if RUN_FUN_TESTS
+check_PROGRAMS		+= $(fun_checks)
+endif
 
 int_checks		= \
 			  int_links_acl_ip_test \
 			  int_timediff_test
 
 fun_checks		= \
 			  fun_config_crypto_test \
 			  fun_onwire_upgrade_test \
 			  fun_acl_check_test
 
 # checks below need to be executed manually
 # or with a specifi environment
 
 long_run_checks		= \
 			  fun_pmtud_crypto_test
 
 benchmarks		= \
 			  knet_bench_test
 
 noinst_PROGRAMS		= \
 			  api_knet_handle_new_limit_test \
 			  pckt_test \
 			  $(benchmarks) \
 			  $(long_run_checks) \
-			  $(check_PROGRAMS)
+			  $(api_checks) \
+			  $(int_checks) \
+			  $(fun_checks)
 
 noinst_SCRIPTS		= \
 			  api-test-coverage
 
 TESTS			= $(check_PROGRAMS)
 
 if INSTALL_TESTS
 testsuitedir		= $(TESTDIR)
 testsuite_PROGRAMS	= $(noinst_PROGRAMS)
 endif
 
 check-local: check-api-test-coverage
 
 check-api-test-coverage:
 	chmod u+x $(top_srcdir)/libknet/tests/api-test-coverage
 	$(top_srcdir)/libknet/tests/api-test-coverage $(top_srcdir) $(top_builddir)
 
 pckt_test_SOURCES	= pckt_test.c
 
 int_links_acl_ip_test_SOURCES = int_links_acl_ip.c \
 				../common.c \
 				../compat.c \
 				../logging.c \
 				../netutils.c \
 				../threads_common.c \
 				../onwire.c \
 				../transports.c \
 				../transport_common.c \
 				../transport_loopback.c \
 				../transport_sctp.c \
 				../transport_udp.c \
 				../links_acl.c \
 				../links_acl_ip.c \
 				../links_acl_loopback.c \
 				../lib_config.c
 
 int_timediff_test_SOURCES = int_timediff.c
 
 knet_bench_test_SOURCES	= knet_bench.c \
 			  test-common.c \
 			  ../common.c \
 			  ../logging.c \
 			  ../compat.c \
 			  ../transport_common.c \
 			  ../threads_common.c \
 			  ../onwire.c \
 			  ../lib_config.c
 
 fun_pmtud_crypto_test_SOURCES = fun_pmtud_crypto.c \
 				test-common.c \
 				../onwire.c \
 				../logging.c \
 				../threads_common.c \
 				../lib_config.c
 
 fun_config_crypto_test_SOURCES = fun_config_crypto.c \
 				 test-common.c
 
 fun_onwire_upgrade_test_SOURCES = fun_onwire_upgrade.c \
 				  test-common.c
 
 fun_acl_check_test_SOURCES = fun_acl_check.c \
 			     test-common.c