diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..9c00b47
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,14 @@
+# Binaries
+\.dll$
+\.exe$
+\.so$
+
+# Files generated by Visual Studio
+\.aps$
+\.ncb$
+\.suo$
+\.user$
+
+# Build directories
+/Debug.*
+/Release.*
diff --git a/core/Makefile b/core/Makefile
index 8c1489b..c227d80 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -102,7 +102,7 @@ all: check
 	$(MAKE) -f Makefile metamod
 
 check:
-	if [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=left4dead or ENGINE=orangebox"; \
 		exit 1; \
 	fi
diff --git a/sample_mm/Makefile b/sample_mm/Makefile
index eaf78e7..f02b083 100755
--- a/sample_mm/Makefile
+++ b/sample_mm/Makefile
@@ -103,7 +103,7 @@ all: check
 	$(MAKE) -f Makefile sample_mm
 	
 check:
-	if [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=left4dead or ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi
diff --git a/stub_mm/Makefile b/stub_mm/Makefile
index 733a940..245ca33 100644
--- a/stub_mm/Makefile
+++ b/stub_mm/Makefile
@@ -103,7 +103,7 @@ all: check
 	$(MAKE) -f Makefile stub_mm
 	
 check:
-	if [ "$(ENGSET)" == "false" ]; then \
+	if [ "$(ENGSET)" = "false" ]; then \
 		echo "You must supply ENGINE=left4dead or ENGINE=orangebox or ENGINE=original"; \
 		exit 1; \
 	fi