diff --git a/debian/patches/0001-build.patch b/debian/patches/0001-build.patch
index 7ce6083..0993069 100644
--- a/debian/patches/0001-build.patch
+++ b/debian/patches/0001-build.patch
@@ -16,4 +16,4 @@ diff -Naurp lzd.orig/configure lzd/configure
 +#LDFLAGS=
  
  # checking whether we are using GNU C++.
- ${CXX} --version > /dev/null 2>&1
+ if /bin/sh -c "${CXX} --version" > /dev/null 2>&1 ; then true