Linux broke somehow. Restore it with system jpeg.

CMake/CMakeMacros.cmake

@@ -1,3 +1,10 @@
+# Borrowed from http://stackoverflow.com/a/3323227/445373
+function(sm_list_replace container index newvalue)
+  list(INSERT ${container} ${index} ${newvalue})
+  math(EXPR __INDEX "${index} + 1")
+  list(REMOVE_AT ${container} ${__INDEX})
+endfunction()
+
 function(sm_append_simple_target_property target property str)
   get_target_property(current_property ${target} ${property})
   if (current_property)

StepmaniaCore.cmake

@@ -158,6 +158,11 @@ elseif(LINUX)
     message(FATAL_ERROR "zlib support required.")
   endif()
 
+  find_package("JPEG")
+  if(NOT(${JPEG_FOUND}))
+    message(FATAL_ERROR "jpeg support required.")
+  endif()
+
   find_library(DL_LIBRARY dl)
   if(${LIBDL_FOUND})
     set(HAS_LIBDL TRUE)

extern/CMakeLists.txt

@@ -11,9 +11,7 @@ if (APPLE OR MSVC)
 endif()
 include(CMakeProject-png.cmake)
 
-if (NOT MSVC)
-  include(CMakeProject-jpeg.cmake)
 if (APPLE)
+  include(CMakeProject-jpeg.cmake)
   include(CMakeProject-mad.cmake)
 endif()
-endif()

src/CMakeLists.txt

@@ -493,6 +493,7 @@ elseif(APPLE)
   )
 else() # Unix / Linux
   # TODO: Remember to find and locate the zip archive files.
+  sm_list_replace(SMDATA_LINK_LIB 8 "${JPEG_LIBRARY}")
   if (HAS_FFMPEG)
     if(WITH_SYSTEM_FFMPEG)
       list(APPEND SMDATA_LINK_LIB
@@ -596,14 +597,17 @@ if(NOT APPLE)
   list(APPEND SM_INCLUDE_DIRS
     "${SM_EXTERN_DIR}/glew-1.5.8/include"
     "${SM_EXTERN_DIR}/jsoncpp/include"
-    "${SM_EXTERN_DIR}/libjpeg"
     "${SM_EXTERN_DIR}/zlib"
   )
   if(MSVC)
     list(APPEND SM_INCLUDE_DIRS
       "${SM_EXTERN_DIR}/ffmpeg/include"
+      "${SM_EXTERN_DIR}/libjpeg"
     )
   else()
+    list(APPEND SM_INCLUDE_DIRS
+      "${JPEG_INCLUDE_DIR}"
+    )
     if (HAS_FFMPEG)
       if (WITH_SYSTEM_FFMPEG)
         list(APPEND SM_INCLUDE_DIRS "${FFMPEG_INCLUDE_DIR}")