SOURCES += \
    $$PWD/png.c \
    $$PWD/catalog.c \
    $$PWD/thread.c \
    $$PWD/xstring.c \
    $$PWD/help.c \
    $$PWD/xerror.c \
    $$PWD/xshl.c \
    $$PWD/xldio.c \
    $$PWD/xstdio.c \
    $$PWD/xmenu.c \
    $$PWD/timers.c