Shell hack to automatically find the git root.

lib/coq/Makefile

-include ../../Makefile.config
+# Incantation to find the root of the git repository.
+ROOT := $(shell while ! [ -d ./.git ] ; do cd .. ; done && pwd)
+
+# Find TLC.
+include $(ROOT)/Makefile.config
+
+# Compile.
 INCLUDE := -I $(TLC)
-include ../../Makefile.coq
+include $(ROOT)/Makefile.coq
+