1 files changed, 30 insertions, 0 deletions
diff --git a/src/external/crypto.m4 b/src/external/crypto.m4
new file mode 100644
index 0000000..b21645d
--- /dev/null
+++ b/src/external/crypto.m4
@@ -0,0 +1,30 @@
+AC_DEFUN([AM_CHECK_LIBCRYPTO],
+         [PKG_CHECK_MODULES([CRYPTO],[libcrypto])
+          PKG_CHECK_MODULES([SSL],[libssl])
+])
+
+AC_MSG_CHECKING([whether OpenSSL's x400Address is ASN1_STRING])
+SAVE_CFLAGS=$CFLAGS
+CFLAGS="$CFLAGS -Werror -Wall -Wextra"
+AC_COMPILE_IFELSE(
+                  [AC_LANG_SOURCE([
+                      #include <openssl/x509v3.h>
+
+                      int main(void)
+                      {
+                          GENERAL_NAME gn = { 0 };
+
+                          return ASN1_STRING_length(gn.d.x400Address);
+                      }
+                  ])],
+                  [
+                      AC_MSG_RESULT([yes])
+                      AC_DEFINE([HAVE_X400ADDRESS_STRING],
+                             [1],
+                             [whether OpenSSL's x400Address is ASN1_STRING])],
+                  [
+                      AC_MSG_RESULT([no])
+                      AC_MSG_WARN([OpenSSL's x400Address is not of ASN1_STRING type])
+                  ])
+
+CFLAGS=$SAVE_CFLAGS