diff --git a/Tests/Complex/CMakeLists.txt b/Tests/Complex/CMakeLists.txt
index fd3a2ba1a..c28ea622a 100644
--- a/Tests/Complex/CMakeLists.txt
+++ b/Tests/Complex/CMakeLists.txt
@@ -12,6 +12,16 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 ADD_DEFINITIONS(-DCMAKE_IS_FUN)
 
+# use the ANSI flags to compile complex as it uses cmSystemTools from
+# the cmake library which requires ansi
+IF (CMAKE_ANSI_CXXFLAGS)
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")  
+ENDIF (CMAKE_ANSI_CXXFLAGS)
+
+IF (CMAKE_ANSI_CFLAGS)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")  
+ENDIF (CMAKE_ANSI_CFLAGS)
+
 #
 # Include vars from a file and from a cache
 #
diff --git a/Tests/ComplexOneConfig/CMakeLists.txt b/Tests/ComplexOneConfig/CMakeLists.txt
index fd3a2ba1a..c28ea622a 100644
--- a/Tests/ComplexOneConfig/CMakeLists.txt
+++ b/Tests/ComplexOneConfig/CMakeLists.txt
@@ -12,6 +12,16 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 ADD_DEFINITIONS(-DCMAKE_IS_FUN)
 
+# use the ANSI flags to compile complex as it uses cmSystemTools from
+# the cmake library which requires ansi
+IF (CMAKE_ANSI_CXXFLAGS)
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")  
+ENDIF (CMAKE_ANSI_CXXFLAGS)
+
+IF (CMAKE_ANSI_CFLAGS)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")  
+ENDIF (CMAKE_ANSI_CFLAGS)
+
 #
 # Include vars from a file and from a cache
 #
diff --git a/Tests/ComplexRelativePaths/CMakeLists.txt b/Tests/ComplexRelativePaths/CMakeLists.txt
index fd3a2ba1a..c28ea622a 100644
--- a/Tests/ComplexRelativePaths/CMakeLists.txt
+++ b/Tests/ComplexRelativePaths/CMakeLists.txt
@@ -12,6 +12,16 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 ADD_DEFINITIONS(-DCMAKE_IS_FUN)
 
+# use the ANSI flags to compile complex as it uses cmSystemTools from
+# the cmake library which requires ansi
+IF (CMAKE_ANSI_CXXFLAGS)
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")  
+ENDIF (CMAKE_ANSI_CXXFLAGS)
+
+IF (CMAKE_ANSI_CFLAGS)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")  
+ENDIF (CMAKE_ANSI_CFLAGS)
+
 #
 # Include vars from a file and from a cache
 #