Found the following assert after building on a RHEL 5.2. Don't hesitate to write back for further info / testing! Glad to help.
Alex --- PASS: test-strerror PASS: test-string PASS: test-strstr test-strtod.c:667: assertion failed test-strtod.c:668: assertion failed test-strtod.c:688: assertion failed test-strtod.c:717: assertion failed test-strtod.c:718: assertion failed FAIL: test-strtod PASS: test-sys_stat PASS: test-sys_time PASS: test-unistd PASS: test-vasnprintf PASS: test-vasprintf-posix PASS: test-vasprintf PASS: test-wchar PASS: test-wctype PASS: test-xvasprintf =============================== 1 of 47 tests failed Please report to bug-m4@gnu.org =============================== make[5]: *** [check-TESTS] Error 1 make[5]: Leaving directory `/home/alex/builds/gnu/m4-1.4.11/tests' make[4]: *** [check-am] Error 2 make[4]: Leaving directory `/home/alex/builds/gnu/m4-1.4.11/tests' make[3]: *** [check-recursive] Error 1 make[3]: Leaving directory `/home/alex/builds/gnu/m4-1.4.11/tests' make[2]: *** [check] Error 2 make[2]: Leaving directory `/home/alex/builds/gnu/m4-1.4.11/tests' make[1]: *** [check-recursive] Error 1 make[1]: Leaving directory `/home/alex/builds/gnu/m4-1.4.11' make: *** [check] Error 2