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-rw-r--r--configure.ac4
1 files changed, 2 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac
index d361369..db54332 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,8 +23,8 @@ dnl Checks for libraries.
 dnl Checks for header files.
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(bsearch getpwnam getrlimit killpg mempcpy sigsetmask stpcpy \
-	       strchrnul strsignal strtod strtoimax strtoumax sysconf)
+AC_CHECK_FUNCS(bsearch getpwnam getrlimit isalpha killpg mempcpy sigsetmask \
+	       stpcpy strchrnul strsignal strtod strtoimax strtoumax sysconf)
 
 dnl Check for klibc signal.
 AC_CHECK_FUNC(signal)