Use the pkg-config file when checking for sndio.

cmake/sdlchecks.cmake

@@ -293,16 +293,14 @@ macro(CheckNAS)
 endmacro()
 
 # Requires:
-# - n/a
+# - PkgCheckModules
 # Optional:
 # - SDL_SNDIO_SHARED opt
 # - HAVE_SDL_LOADSO opt
 macro(CheckSNDIO)
   if(SDL_SNDIO)
-    # TODO: set include paths properly, so the sndio headers are found
-    check_include_file(sndio.h HAVE_SNDIO_H)
-    find_library(D_SNDIO_LIB sndio)
-    if(HAVE_SNDIO_H AND D_SNDIO_LIB)
+    pkg_check_modules(PKG_SNDIO sndio)
+    if(PKG_SNDIO_FOUND)
       set(HAVE_SNDIO TRUE)
       file(GLOB SNDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/sndio/*.c)
       list(APPEND SOURCE_FILES ${SNDIO_SOURCES})

configure.ac

@@ -1288,20 +1288,9 @@ CheckSNDIO()
 [AS_HELP_STRING([--enable-sndio], [support the sndio audio API [default=yes]])],
                   , enable_sndio=yes)
     if test x$enable_audio = xyes -a x$enable_sndio = xyes; then
-        AC_CHECK_HEADER(sndio.h, have_sndio_hdr=yes)
-        AC_CHECK_LIB(sndio, sio_open, have_sndio_lib=yes)
+        PKG_CHECK_MODULES([SNDIO], [sndio], audio_sndio=yes, audio_sndio=no)
 
-        AC_MSG_CHECKING(for sndio audio support)
-        have_sndio=no
-
-        if test x$have_sndio_hdr = xyes -a x$have_sndio_lib = xyes; then
-            have_sndio=yes
-            SNDIO_LIBS="-lsndio"
-        fi
-
-        AC_MSG_RESULT($have_sndio)
-
-        if test x$have_sndio = xyes; then
+        if test x$audio_sndio = xyes; then
             AC_ARG_ENABLE(sndio-shared,
 [AS_HELP_STRING([--enable-sndio-shared], [dynamically load sndio audio support [default=yes]])],
                           , enable_sndio_shared=yes)