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-rw-r--r--lib.mk10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib.mk b/lib.mk
index 8b109e2ce8da..aa92d8d94304 100644
--- a/lib.mk
+++ b/lib.mk
@@ -25,6 +25,16 @@ sysconfdir ?= $(prefix)/etc
 mandir ?= $(prefix)/share/man
 
 
+# Initialise support for build directories.
+builddir ?=
+
+ifdef builddir
+  buildprefix = $(builddir)/
+else
+  buildprefix =
+endif
+
+
 # Pass -fPIC if we're building dynamic libraries.
 BUILD_SHARED_LIBS ?= 1