diff --git a/Modules/CheckFunctionExists.cmake b/Modules/CheckFunctionExists.cmake
index 6b9d4b7ee..4fddf4a76 100644
--- a/Modules/CheckFunctionExists.cmake
+++ b/Modules/CheckFunctionExists.cmake
@@ -19,6 +19,6 @@ MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
     SET(${VARIABLE} "" CACHE INTERNAL "Have function ${LIBRARY}")
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
       "Determining if the function ${FUNCTION} exists failed with the following output:\n"
-      "${OUTPUT}\n")
+      "${OUTPUT}\n" APPEND)
   ENDIF(${VARIABLE})
 ENDMACRO(CHECK_FUNCTION_EXISTS)
diff --git a/Modules/CheckIncludeFile.cmake b/Modules/CheckIncludeFile.cmake
index 19f4dba19..efefa152c 100644
--- a/Modules/CheckIncludeFile.cmake
+++ b/Modules/CheckIncludeFile.cmake
@@ -21,6 +21,6 @@ MACRO(CHECK_INCLUDE_FILE INCLUDE VARIABLE)
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
       "Determining if the include file ${INCLUDE} "
       "exists failed with the following output:\n"
-      "${OUTPUT}\n")
+      "${OUTPUT}\n" APPEND)
   ENDIF(${VARIABLE})
 ENDMACRO(CHECK_INCLUDE_FILE)
diff --git a/Modules/CheckLibraryExists.cmake b/Modules/CheckLibraryExists.cmake
index 7437b9b39..ce3d6e7d1 100644
--- a/Modules/CheckLibraryExists.cmake
+++ b/Modules/CheckLibraryExists.cmake
@@ -23,7 +23,8 @@ MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
   ELSE(${VARIABLE})
     SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
-      "Determining if the function ${FUNCTION} exists in the ${LIBRARY} failed with the following output:\n"
-      "${OUTPUT}\n")
+      "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
+      "failed with the following output:\n"
+      "${OUTPUT}\n" APPEND)
   ENDIF(${VARIABLE})
 ENDMACRO(CHECK_LIBRARY_EXISTS)
diff --git a/Modules/CheckSizeOf.cmake b/Modules/CheckSizeOf.cmake
index 82d9f4309..57b7f2141 100644
--- a/Modules/CheckSizeOf.cmake
+++ b/Modules/CheckSizeOf.cmake
@@ -22,6 +22,7 @@ MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
           OUTPUT_VARIABLE OUTPUT)
   IF(NOT HAVE_${VARIABLE})
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
-      "Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\n")
+      "Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\n"
+      APPEND)
   ENDIF(NOT HAVE_${VARIABLE})
 ENDMACRO(CHECK_TYPE_SIZE)
diff --git a/Modules/TestBigEndian.cmake b/Modules/TestBigEndian.cmake
index c729a82fa..2be59e34d 100644
--- a/Modules/TestBigEndian.cmake
+++ b/Modules/TestBigEndian.cmake
@@ -11,6 +11,7 @@ MACRO(TEST_BIG_ENDIAN VARIABLE)
           OUTPUT_VARIABLE OUTPUT)
   IF(NOT HAVE_${VARIABLE})
     WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
-      "Determining the endianes of the system failed with the following output:\n${OUTPUT}\n")
+      "Determining the endianes of the system failed with the following output:\n${OUTPUT}\n"
+      APPEND)
   ENDIF(NOT HAVE_${VARIABLE})
 ENDMACRO(TEST_BIG_ENDIAN)