diff --git a/conf/distro/include/tcmode-external-sourcery.inc b/conf/distro/include/tcmode-external-sourcery.inc
index 22887a4..c66264e 100644
--- a/conf/distro/include/tcmode-external-sourcery.inc
+++ b/conf/distro/include/tcmode-external-sourcery.inc
@@ -17,7 +17,16 @@ CSL_TARGET_SYS_i686 ?= "i686-pc-linux-gnu"
 CSL_TARGET_SYS_i586 ?= "i686-pc-linux-gnu"
 CSL_TARGET_SYS = "${TARGET_SYS}"
 
-TARGET_PREFIX = "${CSL_TARGET_SYS}-"
+def csl_target_sys(d):
+    toolchain_path = d.getVar('EXTERNAL_TOOLCHAIN', True)
+
+    for triplet in d.getVar('CSL_TARGET_SYS', True).split():
+        gcc = os.path.join(toolchain_path, 'bin', triplet + '-gcc')
+        if os.path.exists(gcc):
+            return triplet + '-'
+    return ''
+
+TARGET_PREFIX = "${@csl_target_sys(d)}"
 
 PREFERRED_PROVIDER_linux-libc-headers = "external-sourcery-toolchain"
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc = "external-sourcery-toolchain"