diff --git a/BLFS/envars.conf b/BLFS/envars.conf
index c175589..6870d78 100644
--- a/BLFS/envars.conf
+++ b/BLFS/envars.conf
@@ -91,3 +91,11 @@ export MAKEFLAGS="-j5"
 #export OTHER_CXXFLAGS=$CXXFLAGS
 #export OTHER_LDFLAGS=$LDFLAGS
 
+#======== Environment settings ========
+
+# Since the startup files may be changed in the course
+# of a build, ensure that environment variables are
+# up to date
+
+source /etc/profile
+