diff --git a/.gitignore b/.gitignore
index 3551c36..16aac0a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /pmake*
 *.o
 /src/compiler/*.c
+/src/action/*.c
 /src/js/*.c
diff --git a/GNUmakefile b/GNUmakefile
index 925b30c..769031d 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -30,16 +30,18 @@ CFLAGS += -Iexternal/duktape -Iexternal/stb
 OBJS = src/main.o src/js.o
 OBJS += external/duktape/duktape.o external/stb/stb_ds.o
 
+NAME = rev | cut -d/ -f1 | rev | cut -d. -f1
+
 .PHONY: all clean mk maint
 .SUFFIXES: .c .o
 
 all: pmake$(EXE)
 
-include mk/compiler.mk
+include mk/js.mk
 
-mk/compiler.mk:
-	find src/js src/compiler -name "*.js" | while read js; do \
-		name="`echo $$js | cut -d/ -f2`_`echo $$js | rev | cut -d/ -f1 | rev | cut -d. -f1`" ; \
+mk/js.mk:
+	find src/js src/action src/compiler -name "*.js" | while read js; do \
+		name="`echo $$js | cut -d/ -f2`_`echo $$js | $(NAME)`" ; \
 		c="`echo $$js | sed 's/\.js$$/.c/'`" ; \
 		o="`echo $$js | sed 's/\.js$$/.o/'`" ; \
 		echo "OBJS += $$o" ; \
@@ -48,7 +50,7 @@ mk/compiler.mk:
 		echo "" ; \
 	done > $@
 
-mk: mk/compiler.mk
+mk: mk/js.mk
 
 maint:
 	rm -f mk/*.mk
@@ -62,9 +64,18 @@ src/config.h:
 	echo "" >> $@
 	echo "#define COMPILERS \\" >> $@
 	find src/compiler -name "*.js" | while read js; do \
-		echo "	X(`echo $$js | rev | cut -d/ -f1 | rev | cut -d. -f1`) \\" ; \
+		echo "	X(`echo $$js | $(NAME)`) \\" ; \
 	done >> $@
 	echo "" >> $@
+	echo "#define ACTIONS \\" >> $@
+	find src/action -name "*.js" | while read js; do \
+		echo "	X(`echo $$js | $(NAME)`) \\" ; \
+	done >> $@
+	echo "" >> $@
+	echo "#define JS \\" >> $@
+	echo "	COMPILERS \\" >> $@
+	echo "	ACTIONS" >> $@
+	echo "" >> $@
 	echo "#endif" >> $@
 
 pmake$(EXE): $(OBJS)
diff --git a/mk/compiler.mk b/mk/js.mk
similarity index 79%
rename from mk/compiler.mk
rename to mk/js.mk
index 85d3ed2..14dea5f 100644
--- a/mk/compiler.mk
+++ b/mk/js.mk
@@ -6,6 +6,10 @@ OBJS += src/js/cmdline.o
 src/js/cmdline.c: src/js/cmdline.js
 	xxd -njs_cmdline -i src/js/cmdline.js > src/js/cmdline.c
 
+OBJS += src/action/gmake.o
+src/action/gmake.c: src/action/gmake.js
+	xxd -naction_gmake -i src/action/gmake.js > src/action/gmake.c
+
 OBJS += src/compiler/watcom.o
 src/compiler/watcom.c: src/compiler/watcom.js
 	xxd -ncompiler_watcom -i src/compiler/watcom.js > src/compiler/watcom.c
diff --git a/src/action/gmake.js b/src/action/gmake.js
new file mode 100644
index 0000000..e69de29
diff --git a/src/config.h b/src/config.h
index 5f31d7f..0afd2a4 100644
--- a/src/config.h
+++ b/src/config.h
@@ -5,4 +5,11 @@
 	X(watcom) \
 	X(gcc) \
 
+#define ACTIONS \
+	X(gmake) \
+
+#define JS \
+	COMPILERS \
+	ACTIONS
+
 #endif
diff --git a/src/js/cmdline.js b/src/js/cmdline.js
index 5a4aa04..49fd118 100644
--- a/src/js/cmdline.js
+++ b/src/js/cmdline.js
@@ -9,5 +9,11 @@ for(var i = 1; i < ARGV.length; i++){
 		console.log("");
 		console.log("Usage: " + ARGV[0] + " [options] action [arguments]");
 		process.exit(0);
+	}else if(ARGV[i].startsWith("--")){
+		console.log("Error: invalid option '" + ARGV[i].substr(2) + "'");
+		process.exit(1);
+	}else{
+		console.log("Error: no such action '" + ARGV[i] + "'");
+		process.exit(1);
 	}
 }
diff --git a/src/pmake.h b/src/pmake.h
index 78e5347..7448d18 100644
--- a/src/pmake.h
+++ b/src/pmake.h
@@ -15,7 +15,7 @@
 	extern unsigned int name ## _len;
 
 #define X(name) LOAD(compiler_ ## name)
-COMPILERS;
+JS;
 #undef X
 
 /* js.c */