Index: Mk/Uses/cmake.mk
===================================================================
--- Mk/Uses/cmake.mk
+++ Mk/Uses/cmake.mk
@@ -7,6 +7,7 @@
 # Valid ARGS:		outsource
 # ARGS description:
 # outsource		perform an out-of-source build
+# noninja		don't use ninja instead of make
 #
 #
 # Additional variables that affect cmake behaviour:
@@ -14,7 +15,6 @@
 # User defined variables:
 # CMAKE_NOCOLOR		- Disable colour build output
 #			Default: not set, unless BATCH or PACKAGE_BUILDING is defined
-# CMAKE_NINJA		- Use ninja instead of make(1)
 #
 # Variables for ports:
 # CMAKE_ARGS		- Arguments passed to cmake
@@ -36,7 +36,7 @@
 .if !defined(_INCLUDE_USES_CMAKE_MK)
 _INCLUDE_USES_CMAKE_MK=	yes
 
-_valid_ARGS=		outsource run
+_valid_ARGS=		outsource run noninja
 
 # Sanity check
 .for arg in ${cmake_ARGS}
@@ -91,7 +91,7 @@
 CMAKE_ARGS+=		-DCMAKE_COLOR_MAKEFILE:BOOL=OFF
 .endif
 
-.if defined(CMAKE_NINJA)
+.if empty(cmake_ARGS:Mnoninja)
 .include "${USESDIR}/ninja.mk"
 .endif