kvazaar: enable dispatch on powerpc

multimedia/kvazaar/Portfile

@@ -6,7 +6,7 @@ PortGroup           compiler_blacklist_versions 1.0
 
 github.setup        ultravideo kvazaar 2.3.1 v
 github.tarball_from releases
-revision            0
+revision            1
 categories          multimedia devel
 license             BSD
 maintainers         {makr @mohd-akram} openmaintainer
@@ -22,3 +22,7 @@ checksums           rmd160  65fe6d5f27230fe51cfe0fb6e76761795c2a6699 \
 # implicit declaration of function '_tzcnt_u32' is invalid in C99
 # uses newer intrinsic functions
 compiler.blacklist  {clang < 700} {*gcc-[34].*}
+
+# On 10a190 either drop the patch or use libdispatch-legacy port.
+# On 10.6.8 ppc this works.
+patchfiles-append   patch-enable-dispatch.diff

multimedia/kvazaar/files/patch-enable-dispatch.diff

@@ -0,0 +1,14 @@
+--- src/threads.h	2024-01-19 19:07:44.000000000 +0800
++++ src/threads.h	2024-12-29 15:40:31.000000000 +0800
+@@ -88,9 +88,9 @@
+
+ #endif //__GNUC__
+
+-#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > 1050 && !defined(__ppc__)
++#if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > 1050
+ // POSIX semaphores are deprecated on Mac so we use Grand Central Dispatch semaphores instead.
+-// However GCD is supported only on 10.6+, and is not supported on any ppc, including 10.6 Rosetta.
++// However GCD is supported only on 10.6+. (Looks like PowerPC on 10.6 can be enabled now.)
+ #include <dispatch/dispatch.h>
+ typedef dispatch_semaphore_t kvz_sem_t;
+