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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 1ee57347..c1cf187c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,6 +11,7 @@ AC_CONFIG_FILES([libqpdf.pc])
AC_CONFIG_HEADERS([libqpdf/qpdf/qpdf-config.h])
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_CXX
AC_HEADER_STDC
LT_INIT([win32-dll])