diff -up openldap-LMDB_0.9.30-d87d682b6db9c04c1bee34e5cadbbcae4e6d9a67/libraries/liblmdb/Makefile.orig2 openldap-LMDB_0.9.30-d87d682b6db9c04c1bee34e5cadbbcae4e6d9a67/libraries/liblmdb/Makefile
--- openldap-LMDB_0.9.30-d87d682b6db9c04c1bee34e5cadbbcae4e6d9a67/libraries/liblmdb/Makefile.orig2	2023-04-17 13:58:34.001243208 +0800
+++ openldap-LMDB_0.9.30-d87d682b6db9c04c1bee34e5cadbbcae4e6d9a67/libraries/liblmdb/Makefile	2023-04-17 14:01:51.153795000 +0800
@@ -18,7 +18,7 @@
 # There may be other macros in mdb.c of interest. You should
 # read mdb.c before changing any of them.
 #
-CC	= gcc
+CC	?= gcc
 AR	= ar
 W	= -W -Wall -Wno-unused-parameter -Wbad-function-cast -Wuninitialized
 THREADS = -pthread