From bac717407f38bbdc467fcb1eb501c8938113df42 Mon Sep 17 00:00:00 2001
From: Trammell Hudson <trammell.hudson@twosigma.com>
Date: Tue, 31 Jan 2017 11:56:14 -0500
Subject: [PATCH] Patch git checkouts, if a patch exists for a module. Add a
 per-module clean target.

---
 Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Makefile b/Makefile
index f2aa2aa6..6144f0fd 100644
--- a/Makefile
+++ b/Makefile
@@ -71,6 +71,10 @@ define define_module =
     # this case, since we don't have a stable version to compare against.
     $(build)/$($1_dir)/.canary:
 	git clone "$($1_repo)" "$(build)/$($1_dir)"
+	if [ -r patches/$1.patch ]; then \
+		( cd $(build)/$($1_dir) ; patch -p1 ) \
+			< patches/$1.patch; \
+	fi
 	touch "$$@"
   else
     # Fetch and verify the source tar file
@@ -122,6 +126,10 @@ define define_module =
 		$(build)/$($1_dir)/.configured
 	$(MAKE) -C "$(build)/$($1_dir)" $($1_target)
 
+  $1.clean:
+	-$(RM) "$(build)/$($1_dir)/.configured
+	-$(MAKE) -C "$(build)/$($1_dir)" clean
+
 .INTERMEDIATE: $1.intermediate
 endef