test_libqrencode.c:2:22: error: qrencode.h: No such file or directory test_libqrencode.c: In function 'main': test_libqrencode.c:6: error: 'QRcode' undeclared (first use in this function) test_libqrencode.c:6: error: (Each undeclared identifier is reported only once test_libqrencode.c:6: error: for each function it appears in.) test_libqrencode.c:6: error: 'code' undeclared (first use in this function) ===> You must install libqrencode(http://megaui.net/fukuchi/works/qrencode/index.en.html) <=== at tools/probe_libqrencode.pl line 19. ...propagated at Makefile.PL line 7.