--- configure.ac	2014-09-12 11:56:38.000000000 +0200
+++ configure.ac.new	2014-09-26 12:30:06.449528612 +0200
@@ -21,17 +21,19 @@
 AC_SEARCH_LIBS([cos], [m], [], [AC_MSG_ERROR([need math library])])
 
 AC_LANG_PUSH([C++])
-AC_CHECK_LIB(mmdb2, MMDB_CCIF_Init, :,
-             AC_MSG_ERROR([mmdb2 library not found.]))
-AC_CHECK_HEADER(mmdb2/mmdb_manager.h, :,
-                AC_MSG_ERROR([mmdb2 headers not found.]))
+# AC_CHECK_LIB(mmdb2, MMDB_CCIF_Init, :,
+#              AC_MSG_ERROR([mmdb2 library not found.]))
+# AC_CHECK_HEADER(mmdb2/mmdb_manager.h, :,
+#                 AC_MSG_ERROR([mmdb2 headers not found.]))
+PKG_CHECK_MODULES(MMDB, mmdb2)
 AC_LANG_POP([C++])
 
 if test "x$enable_superpose" != xno && test "x$enable_ccp4" = xyes; then
-  AC_CHECK_LIB(ccp4c, ccp4_banner, :,
-               AC_MSG_ERROR([ccp4c library not found.]))
-  AC_CHECK_HEADER(ccp4/ccp4_general.h, :,
-                  AC_MSG_ERROR([libccp4 headers not found.]))
+#   AC_CHECK_LIB(ccp4c, ccp4_banner, :,
+#                AC_MSG_ERROR([ccp4c library not found.]))
+#   AC_CHECK_HEADER(ccp4/ccp4_general.h, :,
+#                   AC_MSG_ERROR([libccp4 headers not found.]))
+  PKG_CHECK_MODULES(CCP4, libccp4c > 6.4)
 fi
 
 AM_CONDITIONAL([BUILD_SUPERPOSE], [test "x$enable_ccp4" != xno])