--- a/Makefile.in
+++ b/Makefile.in
@@ -44,7 +44,7 @@
 
 INSTALL_PROGRAM=install -m 755
 INSTALL_DATA=install -m 644
-PWD?=$(shell pwd)
+PWD=$(CURDIR)
 DESTDIR=
 bindir=$(prefix)/bin
 libdir=$(prefix)/lib