diff --git a/GNUmakefile b/GNUmakefile
index 1a15ef2..daf28e7 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,25 +1,30 @@
-TARGET =
+IS_ =
 
-ifeq ($(TARGET),)
-	TARGET = $(shell uname -s)
+ifeq ($(IS_),)
+	IS_ = $(shell uname -s)
 endif
 
 ### Platforms
-ifeq ($(TARGET),Linux)
-	UNIX = 1
+ifeq ($(IS_),Linux)
+	IS_ = 1
 endif
 
-ifeq ($(TARGET),NetBSD)
-	UNIX = 1
+ifeq ($(IS_),NetBSD)
+	IS_ = 1
 endif
 
-ifeq ($(TARGET),Windows)
+ifeq ($(IS_),Windows)
 	MINGW = 1
-	WINDOWS = 1
+	IS_ = 1
+endif
+
+ifeq ($(IS_),Watcom)
+	IS_ = 1
+	IS_ = 1
 endif
 
 ### Stuff
-ifeq ($(UNIX),1)
+ifeq ($(IS_),1)
 	CC = gcc
 	CFLAGS = -c
 	LDFLAGS =
@@ -28,10 +33,21 @@ ifeq ($(UNIX),1)
 	EXE =
 endif
 
-ifeq ($(WINDOWS),1)
+ifeq ($(IS_),1)
 	EXE = .exe
 endif
 
+ifeq ($(IS_),1)
+	CC = owcc
+	CFLAGS = -c
+	LDFLAGS =
+	LIBS =
+
+	ifeq ($(IS_),1)
+		CC += -bnt
+	endif
+endif
+
 ifeq ($(MINGW),1)
 	CC = gcc
 	CFLAGS = -c