Updates to build files.

autogen.sh

@@ -32,10 +32,14 @@ autoreconf --verbose --force --install -Wno-portability  || {
         exit 1
 }
 
-which yelp-build > /dev/null || {
-       echo "Try installing the 'yelp-tools' package."
-       exit 1
-}
+# Only check for yelp-build if help documentation will be built
+# Skip check if SKIP_YELP environment variable is set
+if [ "${SKIP_YELP}" != "1" ]; then
+       which yelp-build > /dev/null || {
+              echo "Try installing the 'yelp-tools' package, or set SKIP_YELP=1 to skip documentation."
+              exit 1
+       }
+fi
 
 cd "$olddir"