CMakeLists: Further improve the error messages regarding CMAKE_SIZEOF_VOID_P
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b6a725..17b5fba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -580,8 +580,10 @@ IF (CMAKE_SIZEOF_VOID_P EQUAL 8)
ADD_DEFINITIONS(-DGIT_ARCH_64)
ELSEIF (CMAKE_SIZEOF_VOID_P EQUAL 4)
ADD_DEFINITIONS(-DGIT_ARCH_32)
-ELSE()
+ELSEIF (CMAKE_SIZEOF_VOID_P)
MESSAGE(FATAL_ERROR "Unsupported architecture (pointer size is ${CMAKE_SIZEOF_VOID_P} bytes)")
+ELSE()
+ MESSAGE(FATAL_ERROR "Unsupported architecture (CMAKE_SIZEOF_VOID_P is unset)")
ENDIF()
# Compile and link libgit2