[MPlayer-users] Compiling error in actual svn mplayer version with libswscale

[xeonitlinux]

Hello whe i tried to compile the actual svn version of mplayer, become a 
compile error with libswscale: 


CC      libswscale/utils.o
libswscale/utils.c: In function 'initFilter':
libswscale/utils.c:351: error: 'M_PI' undeclared (first use in this function)
libswscale/utils.c:351: error: (Each undeclared identifier is reported only 
once
libswscale/utils.c:351: error: for each function it appears in.)
libswscale/utils.c: In function 'sws_getGaussianVec':
libswscale/utils.c:1411: error: 'M_PI' undeclared (first use in this function)
make[1]: *** [libswscale/utils.o] Error 1

Dont know why it is so.

Thank you.