We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

When building libsdl-1.2.15 against libX11-1.5.99.901 on x86_64, I get error on mismatching _XData32 declaration:

gcc -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -I./include -D_GNU_SOURCE=1 -fvisibility=hidden -D_REENTRANT -DXTHREADS -D_REENTRANT -DHAVE_LINUX_VERSION_H -Wall -c ./src/video/x11/SDL_x11dyn.c  -fPIC -DPIC -o build/.libs/SDL_x11dyn.o
./src/video/x11/SDL_x11sym.h:168:17: error: conflicting types for '_XData32'
 SDL_X11_SYM(int,_XData32,(Display *dpy,register long *data,unsigned len),(dpy,data,len),return)
                 ^
./src/video/x11/SDL_x11dyn.c:95:5: note: in definition of macro 'SDL_X11_SYM'
  rc fn params { ret p##fn args ; }
     ^
In file included from ./src/video/x11/SDL_x11dyn.h:34:0,
                 from ./src/video/x11/SDL_x11dyn.c:26:
/usr/include/X11/Xlibint.h:595:12: note: previous declaration of '_XData32' was here
 extern int _XData32(
            ^
make: *** [build/SDL_x11dyn.lo] Error 1


This is due to changes in libX11 coming with commit:

commit f0b171c8ea7b055ba520272ea9a2604e18841ac7
Author: Alan Coopersmith <alan.coopersmith@oracle.com>
Date:   Fri Feb 15 23:34:40 2013 -0800

    Preserve constness in casting arguments through the Data*() routines
    
    Casts were annoying gcc by dropping constness when changing types,
    when routines simply either copy data into the request buffer or
    send it directly to the X server, and never modify the input.
    
    Fixes gcc warnings including:
    ChProp.c: In function 'XChangeProperty':
    ChProp.c:65:6: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    ChProp.c:65:6: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    ChProp.c:74:6: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    ChProp.c:74:6: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    ChProp.c:83:6: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    SetHints.c: In function 'XSetStandardProperties':
    SetHints.c:262:20: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    SetPntMap.c: In function 'XSetPointerMapping':
    SetPntMap.c:46:5: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    SetPntMap.c:46:5: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    StBytes.c: In function 'XStoreBuffer':
    StBytes.c:97:33: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    StName.c: In function 'XStoreName':
    StName.c:40:27: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    StName.c: In function 'XSetIconName':
    StName.c:51:27: warning: cast discards '__attribute__((const))' qualifier from pointer target type [-Wcast-qual]
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

Relevant change in <X11/Xlibint.h> is:

 extern int _XData32(
             Display *dpy,
-            register long *data,
+            register _Xconst long *data,
             unsigned len
 );

Reading SDL 1.2 and 2 hg repositories, I believe both of them are affected.