I've observed this binary linking successfully on Debian but not on Ubuntu. The package uses an autotools build system. On Ubuntu, gcc link complains about unresolved reference to ceilf, even though -lm is in the linker command line Can anybody comment on the correct way to go about this? On both platforms, autoreconf is executed as part of the package build from debian/rules and there is one patch against configure.ac, for supporting HURD and kFreeBSD kernels. Source: http://anonscm.debian.org/gitweb/?p=collab-maint/avis-client-c.git;a=tree Ubuntu error: /bin/bash ../../libtool --tag=CC --mode=link gcc -Wall -pedantic -pthread -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -lm -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -o tests tests.o check_messages.o check_security.o check_client.o check_collections.o check_invoke.o check_uri.o ../../src/lib/libavis.la ../../packages/check/src/libcheck.la libtool: link: gcc -Wall -pedantic -pthread -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z -Wl,relro -Wl,-z -Wl,now -o .libs/tests tests.o check_messages.o check_security.o check_client.o check_collections.o check_invoke.o check_uri.o -lm ../../src/lib/.libs/libavis.so ../../packages/check/src/.libs/libcheck.a -pthread ../../src/lib/.libs/libavis.so: undefined reference to `ceilf' collect2: error: ld returned 1 exit status make[4]: *** [tests] Error 1 make[4]: Leaving directory `/tmp/buildd/avis-client-c-1.2.4/src/test' Full Ubuntu bug details (with config.status and config.log): https://bugs.launchpad.net/ubuntu/+bug/1224928 Debian build log (successful build): https://buildd.debian.org/status/fetch.php?pkg=avis-client-c&arch=i386&ver=1.2.4-7&stamp=1378377013 _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf