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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 749840d8..75c47990 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,7 @@ saved_libs="$LIBS"
LIBS="$LIBS -lc $LIBM"
AC_REPLACE_FUNCS(fmod getcwd putenv snprintf strerror strtol)
LIBS="$saved_libs"
-AC_CHECK_FUNCS(gettimeofday rename strcasecmp strncasecmp strsep)
+AC_CHECK_FUNCS(gettimeofday isatty rename strcasecmp strncasecmp strsep)
GROFF_MKSTEMP
AC_DECL_SYS_SIGLIST
dnl checks for compiler characteristics