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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 d15a6cda2..4329afb9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1317,6 +1317,7 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
 	       erand48 open_memstream \
 	       posix_openpt \
 	       wctomb iconv \
+	       isinf isnan \
 	       grantpt unlockpt ptsname \
 	       htons ntohs \
 	       regcomp regexec regerror regfree \