the commit http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=8c9e4114a23aad96b...

was added in 2006 with a FIXME hint that it could cause a build error. this is exactly what happens when using the header with musl libc to build software depending on alsa-lib (for example "sweep").

may i ask what for this hack was added ? i suspect it's for supporting some ancient version of glibc that didnt define those structs. in that case something like

#if defined(__GLIBC__) && (__GLIBC__ < 2)

would probably make more sense. i could even imagine that the target for the hack is no longer supported anyway, so i think it could simply be removed.

the problematic part is that it's the job of the *application* to request the POSIX namespace, not the job of the libc.

since sweep's build environment does not set _POSIX_SOURCE, the code gets activated and causes a conflict.

--JS

p.s. thanks for applying the signal.h patch!