requires GNU grep for 'grep -e' functionality

imagemagick/imagemagick.spec

@@ -53,7 +53,7 @@ Source0:      ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick-%{V_dist}.ta
 #   build information
 Prefix:       %{l_prefix}
 BuildRoot:    %{l_buildroot}
-BuildPreReq:  OpenPKG, openpkg >= 20040130, make, gcc
+BuildPreReq:  OpenPKG, openpkg >= 20040130, make, gcc, grep
 PreReq:       OpenPKG, openpkg >= 20040130
 BuildPreReq:  tiff, jpeg, jasper, bzip2, zlib, png, freetype, lcms, libxml
 PreReq:       tiff, jpeg, jasper, bzip2, zlib, png, freetype, lcms, libxml