diff --git a/CMakeLists.txt b/CMakeLists.txt
index a5f4cdb..0e151ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,10 @@ function(resolve_library VARIABLE FALLBACK PATHS)
 	endif()
 endfunction()
 
+if (NOT BUILD_OS_ARCH)
+	set(BUILD_OS_ARCH $ENV{BUILD_OS_ARCH})
+endif ()
+
 resolve_library(LIBRARY_TOM_MATH                OFF "${LIBRARY_PATH}/tommath/build/libtommathStatic.a")
 resolve_library(LIBRARY_TOM_CRYPT               OFF "${LIBRARY_PATH}/tomcrypt/libtomcrypt.a")
 resolve_library(LIBRARY_PATH_BREAKPAD           OFF "${LIBRARY_PATH}/breakpad/build/src/client/linux/libbreakpad_client.a")