Hello I've been trying to add Skypopen to my freeswitch for a test but I get to below error when I need to build skypopen.ko OSS sound driver! [root@44128 oss]# make clean; make; insmod ./skypopen.ko; mknod /dev/dsp c 14 3 rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions make -C /lib/modules/2.6.32-042stab084.26/build M=/usr/src/freeswitch/src/mod/endpoints/mod_skypopen/oss LDDINC=/usr/src/freeswitch/src/mod/endpoints/mod_skypopen/oss/../include modules make: *** /lib/modules/2.6.32-042stab084.26/build: No such file or directory.  Stop. make: *** [modules] Error 2 insmod: can't read './skypopen.ko': No such file or directory mknod: `/dev/dsp': File exists I'm using Centos 6.5 64b. Any help would be much appreciated. Farzad