stk: Update to 5.0.0

The library major version remains at 4.

audio/stk/Portfile

@@ -6,11 +6,11 @@ PortGroup           github 1.0
 # configure script checks endianness.
 PortGroup           muniversal 1.0
 
-github.setup        thestk stk 4.6.2
+github.setup        thestk stk 5.0.0
 revision            0
-checksums           rmd160  c72434e680761fc531650a376fc9a3946134383c \
-                    sha256  573e26ccf72ce436a1dc4ee3bea05fd35e0a8e742c339c7f5b85225502238083 \
-                    size    2618125
+checksums           rmd160  029a3bf04478242b734453ddab8189a17cd9269b \
+                    sha256  0e97d8d2ef0d0d3dd4255fed6d71fcbd832f9977bd1031d2166cdbb865529f11 \
+                    size    2830586
 
 categories          audio
 maintainers         {ryandesign @ryandesign} openmaintainer
@@ -45,8 +45,15 @@ master_sites        ${homepage}release/
 
 set rawwave_path    ${prefix}/share/stk/rawwaves/
 
+depends_build       port:autoconf-archive
+
 post-extract {
     file attributes ${worksrcpath} -permissions a+rx
+
+    # This file is missing from the tarball, though it is in the repository.
+    # https://github.com/thestk/stk/issues/139
+    file mkdir ${worksrcpath}/m4
+    ln ${prefix}/share/aclocal/ax_cxx_compile_stdcxx.m4 ${worksrcpath}/m4
 }
 
 patchfiles          library-name.patch \