Question

Here is my qmake file. For whatever reason, when I try to compile the program SDL isn’t being recognized. Why is this?

LIBS += -L/usr/include/SDL.h -lSDL

HEADERS += \
    render.h \
    screenwriter.h

SOURCES += \
    screenwriter.cpp \
    render.cpp

Answer 1

It seems SDL uses pkgconfig:

$ repoquery -l SDL-devel | fgrep .pc
/usr/lib/pkgconfig/sdl.pc
/usr/lib64/pkgconfig/sdl.pc

So the best way to link with it would be to use link_pkgconfig, instead of adding it manually to LIBS:

CONFIG += link_pkgconfig
PKGCONFIG += sdl

This will automatically modify QMAKE_CXXFLAGS, QMAKE_CFLAGS, and LIBS for you, by calling pkg-config --cflags sdl and pkg-config --libs sdl.