diff --git a/Source/kwsys/CMakeLists.txt b/Source/kwsys/CMakeLists.txt
index 4e664b2f0..d85033c3f 100644
--- a/Source/kwsys/CMakeLists.txt
+++ b/Source/kwsys/CMakeLists.txt
@@ -145,7 +145,7 @@ IF(KWSYS_STANDALONE)
 ENDIF(KWSYS_STANDALONE)
 
 # Include helper macros.
-INCLUDE(${CMAKE_CURRENT_SOURCE_DIR}/kwsysPlatformCxxTests.cmake)
+INCLUDE(${CMAKE_CURRENT_SOURCE_DIR}/kwsysPlatformTests.cmake)
 INCLUDE(CheckTypeSize)
 
 # Do full dependency headers.
diff --git a/Source/kwsys/kwsysPlatformCxxTests.cmake b/Source/kwsys/kwsysPlatformTests.cmake
similarity index 65%
rename from Source/kwsys/kwsysPlatformCxxTests.cmake
rename to Source/kwsys/kwsysPlatformTests.cmake
index 6560fa3a2..ddb151f5f 100644
--- a/Source/kwsys/kwsysPlatformCxxTests.cmake
+++ b/Source/kwsys/kwsysPlatformTests.cmake
@@ -1,17 +1,20 @@
-MACRO(KWSYS_PLATFORM_CXX_TEST var description invert)
+SET(KWSYS_PLATFORM_TEST_FILE_C kwsysPlatformTestsC.cxx)
+SET(KWSYS_PLATFORM_TEST_FILE_CXX kwsysPlatformTestsCXX.cxx)
+
+MACRO(KWSYS_PLATFORM_TEST lang var description invert)
   IF("${var}_COMPILED" MATCHES "^${var}_COMPILED$")
     MESSAGE(STATUS "${description}")
     TRY_COMPILE(${var}_COMPILED
       ${CMAKE_CURRENT_BINARY_DIR}
-      ${CMAKE_CURRENT_SOURCE_DIR}/kwsysPlatformCxxTests.cxx
-      COMPILE_DEFINITIONS -DTEST_${var} ${KWSYS_PLATFORM_CXX_TEST_DEFINES} ${KWSYS_PLATFORM_CXX_TEST_EXTRA_FLAGS}
+      ${CMAKE_CURRENT_SOURCE_DIR}/${KWSYS_PLATFORM_TEST_FILE_${lang}}
+      COMPILE_DEFINITIONS -DTEST_${var} ${KWSYS_PLATFORM_TEST_DEFINES} ${KWSYS_PLATFORM_TEST_EXTRA_FLAGS}
       OUTPUT_VARIABLE OUTPUT)
     IF(${var}_COMPILED)
-      FILE(APPEND 
+      FILE(APPEND
         ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
         "${description} compiled with the following output:\n${OUTPUT}\n\n")
     ELSE(${var}_COMPILED)
-      FILE(APPEND 
+      FILE(APPEND
         ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
         "${description} failed to compile with the following output:\n${OUTPUT}\n\n")
     ENDIF(${var}_COMPILED)
@@ -42,15 +45,15 @@ MACRO(KWSYS_PLATFORM_CXX_TEST var description invert)
       SET(${var} 0)
     ENDIF(${var}_COMPILED)
   ENDIF(${invert} MATCHES INVERT)
-ENDMACRO(KWSYS_PLATFORM_CXX_TEST)
+ENDMACRO(KWSYS_PLATFORM_TEST)
 
-MACRO(KWSYS_PLATFORM_CXX_TEST_RUN var description invert)
+MACRO(KWSYS_PLATFORM_TEST_RUN lang var description invert)
   IF("${var}" MATCHES "^${var}$")
     MESSAGE(STATUS "${description}")
     TRY_RUN(${var} ${var}_COMPILED
       ${CMAKE_CURRENT_BINARY_DIR}
-      ${CMAKE_CURRENT_SOURCE_DIR}/kwsysPlatformCxxTests.cxx
-      COMPILE_DEFINITIONS -DTEST_${var} ${KWSYS_PLATFORM_CXX_TEST_DEFINES} ${KWSYS_PLATFORM_CXX_TEST_EXTRA_FLAGS}
+      ${CMAKE_CURRENT_SOURCE_DIR}/${KWSYS_PLATFORM_TEST_FILE_${lang}}
+      COMPILE_DEFINITIONS -DTEST_${var} ${KWSYS_PLATFORM_TEST_DEFINES} ${KWSYS_PLATFORM_TEST_EXTRA_FLAGS}
       OUTPUT_VARIABLE OUTPUT)
 
     # Note that ${var} will be a 0 return value on success.
@@ -115,4 +118,36 @@ MACRO(KWSYS_PLATFORM_CXX_TEST_RUN var description invert)
       SET(${var} 0)
     ENDIF(${var}_COMPILED)
   ENDIF(${invert} MATCHES INVERT)
+ENDMACRO(KWSYS_PLATFORM_TEST_RUN)
+
+MACRO(KWSYS_PLATFORM_C_TEST var description invert)
+  SET(KWSYS_PLATFORM_TEST_DEFINES ${KWSYS_PLATFORM_C_TEST_DEFINES})
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS ${KWSYS_PLATFORM_C_TEST_EXTRA_FLAGS})
+  KWSYS_PLATFORM_TEST(C "${var}" "${description}" "${invert}")
+  SET(KWSYS_PLATFORM_TEST_DEFINES)
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS)
+ENDMACRO(KWSYS_PLATFORM_C_TEST)
+
+MACRO(KWSYS_PLATFORM_C_TEST_RUN var description invert)
+  SET(KWSYS_PLATFORM_TEST_DEFINES ${KWSYS_PLATFORM_C_TEST_DEFINES})
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS ${KWSYS_PLATFORM_C_TEST_EXTRA_FLAGS})
+  KWSYS_PLATFORM_TEST_RUN(C "${var}" "${description}" "${invert}")
+  SET(KWSYS_PLATFORM_TEST_DEFINES)
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS)
+ENDMACRO(KWSYS_PLATFORM_C_TEST_RUN)
+
+MACRO(KWSYS_PLATFORM_CXX_TEST var description invert)
+  SET(KWSYS_PLATFORM_TEST_DEFINES ${KWSYS_PLATFORM_CXX_TEST_DEFINES})
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS ${KWSYS_PLATFORM_CXX_TEST_EXTRA_FLAGS})
+  KWSYS_PLATFORM_TEST(CXX "${var}" "${description}" "${invert}")
+  SET(KWSYS_PLATFORM_TEST_DEFINES)
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS)
+ENDMACRO(KWSYS_PLATFORM_CXX_TEST)
+
+MACRO(KWSYS_PLATFORM_CXX_TEST_RUN var description invert)
+  SET(KWSYS_PLATFORM_TEST_DEFINES ${KWSYS_PLATFORM_CXX_TEST_DEFINES})
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS ${KWSYS_PLATFORM_CXX_TEST_EXTRA_FLAGS})
+  KWSYS_PLATFORM_TEST_RUN(CXX "${var}" "${description}" "${invert}")
+  SET(KWSYS_PLATFORM_TEST_DEFINES)
+  SET(KWSYS_PLATFORM_TEST_EXTRA_FLAGS)
 ENDMACRO(KWSYS_PLATFORM_CXX_TEST_RUN)
diff --git a/Source/kwsys/kwsysPlatformTestsC.c b/Source/kwsys/kwsysPlatformTestsC.c
new file mode 100644
index 000000000..36c5f4d0c
--- /dev/null
+++ b/Source/kwsys/kwsysPlatformTestsC.c
@@ -0,0 +1,25 @@
+/* Macros to define main() in a cross-platform way.
+   Usage:
+
+    int KWSYS_PLATFORM_TEST_C_MAIN()
+    {
+      return 0;
+    }
+
+    int KWSYS_PLATFORM_TEST_C_MAIN_ARGS(argc, argv)
+    {
+      (void)argc; (void)argv;
+      return 0;
+    }
+*/
+#if defined(__CLASSIC_C__)
+# define KWSYS_PLATFORM_TEST_C_MAIN() \
+  main()
+# define KWSYS_PLATFORM_TEST_C_MAIN_ARGS(argc, argv) \
+  main(argc,argv) int argc; char* argv[];
+#else
+# define KWSYS_PLATFORM_TEST_C_MAIN() \
+  main(void)
+# define KWSYS_PLATFORM_TEST_C_MAIN_ARGS(argc, argv) \
+  main(int argc, char* argv[])
+#endif
diff --git a/Source/kwsys/kwsysPlatformCxxTests.cxx b/Source/kwsys/kwsysPlatformTestsCXX.cxx
similarity index 100%
rename from Source/kwsys/kwsysPlatformCxxTests.cxx
rename to Source/kwsys/kwsysPlatformTestsCXX.cxx