Set up gcc environment - 3.3 Checking if your kit is complete... Looks good Writing Makefile for Audio::Mixer cp Mixer.pm blib/lib/Audio/Mixer.pm AutoSplitting blib/lib/Audio/Mixer.pm (blib/lib/auto/Audio/Mixer) cp volume.pl blib/lib/Audio/volume.pl gcc -c -D_REENTRANT -DPRIVLIB_LAST_IN_INC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fno-strict-aliasing -pipe -O -DVERSION=\"0.7\" -DXS_VERSION=\"0.7\" -fPIC "-I/export/home/cpanrun/build/5.10.0/lib/CORE" Mix.c Mix.c:23:27: sys/soundcard.h: No such file or directory Mix.c:29: error: `SOUND_DEVICE_NAMES' undeclared here (not in a function) Mix.c: In function `open_mixer': Mix.c:56: error: `SOUND_MIXER_READ_DEVMASK' undeclared (first use in this function) Mix.c:56: error: (Each undeclared identifier is reported only once Mix.c:56: error: for each function it appears in.) Mix.c:60: error: `SOUND_MIXER_READ_STEREODEVS' undeclared (first use in this function) Mix.c:64: error: `SOUND_MIXER_READ_RECMASK' undeclared (first use in this function) Mix.c: In function `get_param_val': Mix.c:112: error: `SOUND_MIXER_NRDEVICES' undeclared (first use in this function) Mix.c: In function `get_source': Mix.c:149: error: `SOUND_MIXER_READ_RECSRC' undeclared (first use in this function) Mix.c: In function `set_source': Mix.c:180: error: `SOUND_MIXER_NRDEVICES' undeclared (first use in this function) Mix.c:184: error: `SOUND_MIXER_WRITE_RECSRC' undeclared (first use in this function) Mix.c: In function `set_param_val': Mix.c:231: error: `SOUND_MIXER_NRDEVICES' undeclared (first use in this function) Mix.c: In function `get_params_num': Mix.c:266: error: `SOUND_MIXER_NRDEVICES' undeclared (first use in this function) Mix.c: In function `get_params_list': Mix.c:274: error: `SOUND_MIXER_NRDEVICES' undeclared (first use in this function) make: *** [Mix.o] Error 1