build: Note import-src target.

diff --git a/BUILDING.md b/BUILDING.md
index d9418c8e320098bf97c296028bafd8542d2fe7b5..95779511fa05a3363e2ed8eef06ee5f7e646acf3 100644 (file)
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -141,6 +141,9 @@ In this instance, you may wish to disable some configured tests when
 the binary has to run on older versions which lack support, such as getline.
 `./configure --without-getline`
 
+There is also the import-src target which installs just the needed source
+files in a specific directory (like DragonFly).
+`make DESTDIR=/usr/src/contrib/dhcpcd import-src`
 
 ## Hooks
 Not all the hooks in dhcpcd-hooks are installed by default.