Comme j’ai eu le souci (notamment pour faire marcher wxWidgets) je vous fais part de la solution

—> Building libsdl
Error: Target org.macports.build returned: shell command " cd "/opt/local/var…work/SDL-1.2.13" && /usr/bin/make -j2 all " returned error 2
Command output: ./src/video/quartz/SDL_QuartzEvents.m:691: error: ’struct SDL_PrivateVideoData’ has no member named ‘power_connection’
./src/video/quartz/SDL_QuartzEvents.m: In function ‘QZ_PumpEvents’:
./src/video/quartz/SDL_QuartzEvents.m:737: error: ‘UsrActivity’ undeclared (first [...]