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-rw-r--r--configure.in4
1 files changed, 4 insertions, 0 deletions
diff --git a/configure.in b/configure.in
index eae8b06a34..06e07a18d1 100644
--- a/configure.in
+++ b/configure.in
@@ -11,6 +11,10 @@ AC_DEFUN([RUBY_PREREQ_AC],
AC_DISABLE_OPTION_CHECKING
+AC_ARG_VAR([cflags], [additional CFLAGS])
+AC_ARG_VAR([cppflags], [additional CPPFLAGS])
+AC_ARG_VAR([cxxflags], [additional CXXFLAGS])
+
AC_DEFUN([RUBY_RM_RECURSIVE], [
m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]), [2.70]), [-1], [
# suppress error messages, rm: cannot remove 'conftest.dSYM', from