diff --git a/cmake/prebuild.cmake b/cmake/prebuild.cmake
index 02ab708..b51bd0b 100644
--- a/cmake/prebuild.cmake
+++ b/cmake/prebuild.cmake
@@ -37,6 +37,10 @@
 
 # CPUIDEMU = ../../cpuid/table.o
 
+if (NOT DEFINED BLASHELPER_BINARY_DIR)
+  set(BLASHELPER_BINARY_DIR "${PROJECT_BINARY_DIR}")
+endif ()
+
 if (DEFINED CPUIDEMU)
   set(EXFLAGS "-DCPUIDEMU -DVENDOR=99")
 endif ()
@@ -87,7 +87,7 @@ file(MAKE_DIRECTORY ${GETARCH_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GETARCH_RESULT ${GETARCH_DIR}
     SOURCES ${GETARCH_SRC}
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GETARCH_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GETARCH_BIN}
   )
@@ -95,8 +99,8 @@ endif ()
 message(STATUS "Running getarch")
 
 # use the cmake binary w/ the -E param to run a shell command in a cross-platform way
-execute_process(COMMAND ${PROJECT_BINARY_DIR}/${GETARCH_BIN} 0 OUTPUT_VARIABLE GETARCH_MAKE_OUT)
-execute_process(COMMAND ${PROJECT_BINARY_DIR}/${GETARCH_BIN} 1 OUTPUT_VARIABLE GETARCH_CONF_OUT)
+execute_process(COMMAND ${BLASHELPER_BINARY_DIR}/${GETARCH_BIN} 0 OUTPUT_VARIABLE GETARCH_MAKE_OUT)
+execute_process(COMMAND ${BLASHELPER_BINARY_DIR}/${GETARCH_BIN} 1 OUTPUT_VARIABLE GETARCH_CONF_OUT)
 
 message(STATUS "GETARCH results:\n${GETARCH_MAKE_OUT}") 

@@ -114,7 +114,7 @@ file(MAKE_DIRECTORY ${GETARCH2_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GETARCH2_RESULT ${GETARCH2_DIR}
     SOURCES ${PROJECT_SOURCE_DIR}/getarch_2nd.c
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GETARCH2_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GETARCH2_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GETARCH2_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GETARCH2_BIN}
   )
@@ -121,8 +125,8 @@ if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
 endif ()
 
 # use the cmake binary w/ the -E param to run a shell command in a cross-platform way
-execute_process(COMMAND ${PROJECT_BINARY_DIR}/${GETARCH2_BIN} 0 OUTPUT_VARIABLE GETARCH2_MAKE_OUT)
-execute_process(COMMAND ${PROJECT_BINARY_DIR}/${GETARCH2_BIN} 1 OUTPUT_VARIABLE GETARCH2_CONF_OUT)
+execute_process(COMMAND ${BLASHELPER_BINARY_DIR}/${GETARCH2_BIN} 0 OUTPUT_VARIABLE GETARCH2_MAKE_OUT)
+execute_process(COMMAND ${BLASHELPER_BINARY_DIR}/${GETARCH2_BIN} 1 OUTPUT_VARIABLE GETARCH2_CONF_OUT)
 
 # append config data from getarch_2nd to the TARGET file and read in CMake vars
 file(APPEND ${TARGET_CONF} ${GETARCH2_CONF_OUT})
@@ -141,7 +141,7 @@ file(MAKE_DIRECTORY ${GEN_CONFIG_H_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GEN_CONFIG_H_RESULT ${GEN_CONFIG_H_DIR}
     SOURCES ${PROJECT_SOURCE_DIR}/gen_config_h.c
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GEN_CONFIG_H_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GEN_CONFIG_H_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GEN_CONFIG_H_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GEN_CONFIG_H_BIN}
   )