diff --git a/lib/Makefile.b32 b/lib/Makefile.b32
index eec7541be..0dacd8be0 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 53e9f2d05..65183c8aa 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)" == ""