include: prereq-build.mk: improve gcp check

Adjust the check for gcp (GNU copy command) to rule out false positives
with "Goffi's CoPier" a python copy command.

Fixes FS#218.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 4a0509ac00380a272821158b22a29abd0150f511..ed652ca9a729a6bd8e9222012e9ef65bea04bd21 100644 (file)
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -109,8 +109,8 @@ $(eval $(call SetupHostCommand,diff,Please install diffutils, \
        diff --version 2>&1 | grep diff))
 
 $(eval $(call SetupHostCommand,cp,Please install GNU fileutils, \
-       gcp --help, \
-       cp --help))
+       gcp --help 2>&1 | grep 'Copy SOURCE', \
+       cp --help 2>&1 | grep 'Copy SOURCE'))
 
 $(eval $(call SetupHostCommand,seq,, \
        gseq --version, \