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Testing on Linux..

$ hg tags
tip                             8998:995f6cd966a7

$ hg log -l 2
changeset:   8998:995f6cd966a7
tag:         tip
user:        Sam Lantinga <slouken@libsdl.org>
date:        Tue Jul 08 00:42:14 2014 -0700
summary:     Skip JUNK chunks in wave files

changeset:   8997:9e23a50a63f7
user:        Sam Lantinga <slouken@libsdl.org>
date:        Tue Jul 08 00:23:36 2014 -0700
summary:     Strip the binaries before signing them, in release configuration

$ cd visualtest
$ ./autogen.sh
$ ./configure
$ make -j16
gcc -o testharness src/action_configparser.c src/harness_argparser.c src/rwhelper.c src/testharness.c src/variator_exhaustive.c src/variators.c src/screenshot.c src/sut_configparser.c src/variator_common.c src/variator_random.c src/parsehelper.c src/mischelper.c src/linux/linux_process.c src/windows/windows_process.c src/windows/windows_screenshot.c -g -O2 -D_REENTRANT -I/usr/local/include/SDL2   -DHAVE_OPENGLES -I../include -I./include -lSDL2_test -Wl,-rpath,/usr/local/lib -L/usr/local/lib -lSDL2 -lpthread
gcc -o testquit unittest/testquit.c -g -O2 -D_REENTRANT -I/usr/local/include/SDL2   -DHAVE_OPENGLES -I../include -I./include -lSDL2_test -Wl,-rpath,/usr/local/lib -L/usr/local/lib -lSDL2 -lpthread
/tmp/ccU9u5rw.o: In function `ProcessAction':
sdl-2.x/visualtest/src/testharness.c:210: undefined reference to `SDLVisualTest_ScreenshotProcess'
collect2: ld returned 1 exit status
make: *** [testharness] Error 1

$ grep -B 10 -A 10 SDLVisualTest_ScreenshotProcess src/*
src/testharness.c-            if(SDL_IsProcessRunning(&pinfo) != 1)
src/testharness.c-            {
src/testharness.c-                SDLTest_LogError("SUT has quit.");
src/testharness.c-                *sut_running = 0;
src/testharness.c-                return TEST_FAILED;
src/testharness.c-            }
src/testharness.c-
src/testharness.c-            /* file name for the screenshot image */
src/testharness.c-            SDLVisualTest_HashString(args, hash);
src/testharness.c-            SDL_snprintf(path, MAX_PATH_LEN, "%s/%s", state.output_dir, hash);
src/testharness.c:            if(!SDLVisualTest_ScreenshotProcess(&pinfo, path))
src/testharness.c-            {
src/testharness.c:                SDLTest_LogError("SDLVisualTest_ScreenshotProcess() failed");
src/testharness.c-                return TEST_ERROR;
src/testharness.c-            }
src/testharness.c-        }
src/testharness.c-        break;
src/testharness.c-
src/testharness.c-        case SDL_ACTION_VERIFY:
src/testharness.c-        {
src/testharness.c-            int ret;
src/testharness.c-
src/testharness.c-            SDLTest_Log("Action: Verify screenshot");

$ grep -r SDLVisualTest_ScreenshotProcess src/*
src/testharness.c:            if(!SDLVisualTest_ScreenshotProcess(&pinfo, path))
src/testharness.c:                SDLTest_LogError("SDLVisualTest_ScreenshotProcess() failed");
src/windows/windows_screenshot.c:SDLVisualTest_ScreenshotProcess(SDL_ProcessInfo* pinfo, char* prefix)

Turns out SDLVisualTest_ScreenshotProcess is only implemented on Windows at the moment.