02.Building, Configuring kernel for Device Driver Development

i dont understand when i try to install openssl it says already installed but when i run make command it gives error about openssl

Getting error while compiling linux 2.6.36 , fatal error no such file gcc.h in include/linux/compiler-gcc.h , also I dont see if it is any gcc compiler version issue.

CC [M] kernel/kheaders.o
debian/rules:6: recipe for target 'build' failed
make[2]: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
scripts/Makefile.package:73: recipe for target 'deb-pkg' failed
make[1]: *** [deb-pkg] Error 2
Makefile:1469: recipe fpr target 'deb-pkg' failed
make: *** [deb-pkg] Error

/home/nirmal/Documents/Documents_09_08_23/01_open_release/init.c:8:26: error: expected ‘)’ before ‘int’
/home/nirmal/Documents/Documents_09_08_23/01_open_release/init.c:11:1: error: unknown type name ‘dev_t’
11 | dev_t devid, devno;
| ^~~~~
/home/nirmal/Documents/Documents_09_08_23/01_open_release/init.c:13:1: error: unknown type name ‘Dev’
13 | Dev *dev;
| ^~~
/home/nirmal/Documents/Documents_09_08_23/01_open_release/init.c:17:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘initFunc’
17 | static int __init initFunc(void)
| ^~~~~~~~

sol : typo errors sorted out