diff --git a/configure b/configure
index 6451b87673f62..29689a8232f80 100755
--- a/configure
+++ b/configure
@@ -657,6 +657,7 @@ valopt_nosave local-rust-root "/usr/local" "set prefix for local rust binary"
 valopt_nosave host "${CFG_BUILD}" "GNUs ./configure syntax LLVM host triples"
 valopt_nosave target "${CFG_HOST}" "GNUs ./configure syntax LLVM target triples"
 valopt_nosave mandir "${CFG_PREFIX}/share/man" "install man pages in PATH"
+valopt_nosave platform-cfg "${CFG_SRC_DIR}/mk/cfg" "Location of platform configuration"
 
 # On Windows this determines root of the subtree for target libraries.
 # Host runtime libs always go to 'bin'.
@@ -1090,7 +1091,7 @@ CFG_MANDIR=${CFG_MANDIR%/}
 CFG_HOST="$(echo $CFG_HOST | tr ',' ' ')"
 CFG_TARGET="$(echo $CFG_TARGET | tr ',' ' ')"
 CFG_SUPPORTED_TARGET=""
-for target_file in ${CFG_SRC_DIR}mk/cfg/*.mk; do
+for target_file in ${CFG_PLATFORM_CFG}/*.mk; do
   CFG_SUPPORTED_TARGET="${CFG_SUPPORTED_TARGET} $(basename "$target_file" .mk)"
 done
 
@@ -1766,6 +1767,7 @@ putvar CFG_I686_LINUX_ANDROID_NDK
 putvar CFG_NACL_CROSS_PATH
 putvar CFG_MANDIR
 putvar CFG_USING_LIBCPP
+putvar CFG_PLATFORM_CFG
 
 # Avoid spurious warnings from clang by feeding it original source on
 # ccache-miss rather than preprocessed input.
diff --git a/mk/platform.mk b/mk/platform.mk
index c2644621c571a..2621e4434ec87 100644
--- a/mk/platform.mk
+++ b/mk/platform.mk
@@ -97,7 +97,7 @@ $(foreach cvar,CC CXX CPP CFLAGS CXXFLAGS CPPFLAGS, \
 
 CFG_RLIB_GLOB=lib$(1)-*.rlib
 
-include $(wildcard $(CFG_SRC_DIR)mk/cfg/*.mk)
+include $(wildcard $(CFG_PLATFORM_CFG)/*.mk)
 
 define ADD_INSTALLED_OBJECTS
   INSTALLED_OBJECTS_$(1) += $$(CFG_INSTALLED_OBJECTS_$(1))