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Specifically, I'm using Raspbian, though I suspect any Linux distro is probably affected. Build log:

$ make
/bin/bash ./libtool --mode=compile gcc -g  -I./include -D_GNU_SOURCE=1 -fvisibility=hidden  -DXTHREADS -D_REENTRANT -DHAVE_LINUX_VERSION_H -Wall -c ./src/stdlib/SDL_qsort.c  -o build/SDL_qsort.lo
libtool: compile:  gcc -g -I./include -D_GNU_SOURCE=1 -fvisibility=hidden -DXTHREADS -D_REENTRANT -DHAVE_LINUX_VERSION_H -Wall -c ./src/stdlib/SDL_qsort.c  -fPIC -DPIC -o build/.libs/SDL_qsort.o
./src/stdlib/SDL_qsort.c:349:61: error: unknown type name ‘size_t’
 static char * pivot_big(char *first, char *mid, char *last, size_t size,
                                                             ^
./src/stdlib/SDL_qsort.c:390:42: error: unknown type name ‘size_t’
 static void qsort_nonaligned(void *base, size_t nmemb, size_t size,
                                          ^
./src/stdlib/SDL_qsort.c:390:56: error: unknown type name ‘size_t’
 static void qsort_nonaligned(void *base, size_t nmemb, size_t size,
                                                        ^
./src/stdlib/SDL_qsort.c:421:39: error: unknown type name ‘size_t’
 static void qsort_aligned(void *base, size_t nmemb, size_t size,
                                       ^
./src/stdlib/SDL_qsort.c:421:53: error: unknown type name ‘size_t’
 static void qsort_aligned(void *base, size_t nmemb, size_t size,
                                                     ^
./src/stdlib/SDL_qsort.c:452:37: error: unknown type name ‘size_t’
 static void qsort_words(void *base, size_t nmemb,
                                     ^
./src/stdlib/SDL_qsort.c:504:32: error: unknown type name ‘size_t’
 extern void qsortG(void *base, size_t nmemb, size_t size,
                                ^
./src/stdlib/SDL_qsort.c:504:46: error: unknown type name ‘size_t’
 extern void qsortG(void *base, size_t nmemb, size_t size,
                                              ^
build-deps:462: recipe for target 'build/SDL_qsort.lo' failed
make: *** [build/SDL_qsort.lo] Error 1


The only problem is the failure to pick up a typedef for size_t. This can be solved by #include <stddef.h> but I see that it's only a few revisions back that #include "SDL_stdinc.h" was removed, which does it indirectly, so I guess that's the better solution?

diff -r 2f1eb5fa26ea src/stdlib/SDL_qsort.c
--- a/src/stdlib/SDL_qsort.c	Fri Mar 11 08:30:18 2016 -0800
+++ b/src/stdlib/SDL_qsort.c	Tue Mar 22 21:17:46 2016 +0000
@@ -21,6 +21,8 @@
 
 #ifndef HAVE_QSORT
 
+#include "SDL_stdinc.h"
+
 #ifdef assert
 #undef assert
 #endif