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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 53c30c2cf..5e13c0f11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1266,6 +1266,7 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
 	       isblank iswblank \
 	       uname \
 	       signgam tgamma \
+	       log2 \
 	       scalbn \
 	       putenv getenv setenv unsetenv xw\
 	       brk sbrk \