errno 11 and system.h not generated

I have specified the .ptf file for my design which also includes custom instruction.
While building I get the following error.
All the specified files in the error are present in the correct directory,but it says not found.
Also, tell when system.h file will be generated and how to use custom instruction in c.

ERROR:
make -s all includes
6 [main] sh 17244 fork: child 8996 - died waiting for longjmp before initialization, errno 11
/bin/sh: fork: Resource temporarily unavailable
1 [main] sh 9928 fork: child 6028 - died waiting for longjmp before initialization, errno 11
/bin/sh: fork: Resource temporarily unavailable
0 [main] sh 17800 fork: child 1160 - died waiting for longjmp before initialization, errno 11
/bin/sh: fork: Resource temporarily unavailable
/bin/sh: C:/altera/7.2/nios2eds: is a directory
/bin/sh: : command not found
C:/altera/7.2/nios2eds/components/altera_hal/build/app_rules.mk:153: /components/altera_hal/build/gnu_rules.mk: No such file or directory
C:/altera/7.2/nios2eds/components/altera_hal/build/app_rules.mk:157: /components/altera_hal/build/gtf_rules.mk: No such file or directory
make: *** No rule to make target `/components/altera_hal/build/gtf_rules.mk'. Stop.
Build completed in 1.169 seconds

Please help as soon as possible.
Thanks in advance:cool:...