diff --git a/lib/Makefile.b32 b/lib/Makefile.b32
index eec7541be6d175d2316a2cbad61eb342b5729b65..0dacd8be0be06d6d362e2d64ad3ce26be9834992 100644
--- a/lib/Makefile.b32
+++ b/lib/Makefile.b32
@@ -10,6 +10,10 @@
 #  Written by Jaepil Kim, pit@paradise.net.nz
 ############################################################
 
+!if "$(__MAKE__)" == ""
+!error __MAKE__ not defined. Use Borlands's MAKE to process this makefile.
+!endif
+
 # Borland's $(MAKEDIR) expands to the path where make.exe is located,
 # use this feature to define BCCDIR when user has not defined BCCDIR.
 !if "$(BCCDIR)" == ""
diff --git a/src/Makefile.b32 b/src/Makefile.b32
index 53e9f2d05dc275f20a0ced6c3929353cc1b786a6..65183c8aac7cb9f128cfec8bfb37b5f0cd95e7cf 100644
--- a/src/Makefile.b32
+++ b/src/Makefile.b32
@@ -10,6 +10,10 @@
 #  Written by Jaepil Kim, pit@paradise.net.nz
 ############################################################
 
+!if "$(__MAKE__)" == ""
+!error __MAKE__ not defined. Use Borlands's MAKE to process this makefile.
+!endif
+
 # Borland's $(MAKEDIR) expands to the path where make.exe is located,
 # use this feature to define BCCDIR when user has not defined BCCDIR.
 !if "$(BCCDIR)" == ""