Index: trunk/config.h.in
===================================================================
--- trunk/config.h.in	(revision 35928)
+++ trunk/config.h.in	(revision 35929)
@@ -70,6 +70,9 @@
    as ~/DOT_PCB_RND/ */
 #define DOT_PCB_RND "@/local/pcb/dot_pcb_rnd@"
 
+#define PCB_LIBRND_VER_REQ_MAJOR @/local/librnd_ver_req_major@
+#define PCB_LIBRND_VER_REQ_MINOR @/local/librnd_ver_req_minor@
+
 #endif
 @]
 
Index: trunk/scconfig/hooks.c
===================================================================
--- trunk/scconfig/hooks.c	(revision 35928)
+++ trunk/scconfig/hooks.c	(revision 35929)
@@ -16,6 +16,9 @@
 #define REQ_LIBRND_MAJOR 3
 #define REQ_LIBRND_MINOR 1
 
+#define TOSTR_(x) #x
+#define TOSTR(x) TOSTR_(x)
+
 #include <librnd/src_3rd/puplug/scconfig_hooks.h>
 #include <librnd/src_3rd/libfungw/scconfig_hooks.h>
 
@@ -320,6 +323,8 @@
 	put("/local/version",  version);
 	put("/local/version_major",  version_major);
 	put("/local/apiver", apiver);
+	put("/local/librnd_ver_req_major", TOSTR(REQ_LIBRND_MAJOR));
+	put("/local/librnd_ver_req_minor", TOSTR(REQ_LIBRND_MINOR));
 
 	printf("\n");
 
Index: trunk/src/main.c
===================================================================
--- trunk/src/main.c	(revision 35928)
+++ trunk/src/main.c	(revision 35929)
@@ -469,6 +469,15 @@
 
 	rnd_main_args_t ga;
 
+	if (((rnd_api_ver & 0xFF0000) >> 16) != PCB_LIBRND_VER_REQ_MAJOR) {
+		fprintf(stderr, "librnd version problem: need %d.x.x but installed version is %d.x.x (major version mismatch)\n", PCB_LIBRND_VER_REQ_MAJOR, (int)(rnd_api_ver & 0xFF0000) >> 16);
+		exit(1);
+	}
+	if (((rnd_api_ver & 0x00FF00) >> 8) < PCB_LIBRND_VER_REQ_MINOR) {
+		fprintf(stderr, "librnd version problem: need >=%d.%d.x but installed version is %d.%d.x (minor version mismatch)\n", PCB_LIBRND_VER_REQ_MAJOR, PCB_LIBRND_VER_REQ_MINOR, (int)(rnd_api_ver & 0xFF0000) >> 16, (int)(rnd_api_ver & 0x00FF00) >> 8);
+		exit(1);
+	}
+
 	rnd_app.menu_file_paths = menu_file_paths;
 	rnd_app.menu_name_fmt   = menu_name_fmt;
 	rnd_app.default_embedded_menu = rnd_hidlib_default_embedded_menu;