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-rw-r--r--ldapaddressbook/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/ldapaddressbook/configure.ac b/ldapaddressbook/configure.ac
index d3f5f46..aac462f 100644
--- a/ldapaddressbook/configure.ac
+++ b/ldapaddressbook/configure.ac
@@ -16,6 +16,7 @@ AC_CONFIG_HEADERS(config.h)
dnl Checks for programs.
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_LIBTOOL
dnl Checks for libraries.