[pptp-server] Compiling of PPP-2.3.11

[Clement Law]

I installed all the patches and so on, and I get the following errors/warnings.

gcc -O2 -pipe -Wall -g -D_linux_=1 -DHAVE_PATHS_H -DIPX_CHANGE -I../include -DDEBUGALL -DCHAPMS=1 -DUSE_CRYPT=
1 -DHAVE_CRYPT_H=1 -DMPPE=1 -DHAS_SHADOW -DUSE_PAM -DPLUGIN   -c -o md5.o md5.c
md5.c: In function `MD5Final':
md5.c:197: warning: implicit declaration of function `memcpy'

gcc -O2 -pipe -Wall -g -D_linux_=1 -DHAVE_PATHS_H -DIPX_CHANGE -I../include -DDEBUGALL -DCHAPMS=1 -DUSE_CRYPT=1 -DHAVE_CRYPT_H=1 -DMPPE=1 -DHAS_SHADOW -DUSE_PAM -DPLUGIN   -c -o sha1dgst.o sha1dgst.c
sha1dgst.c: In function `GetNewKeyFromSHA':
sha1dgst.c:419: warning: implicit declaration of function `memcpy'

gcc -O2 -pipe -Wall -g -D_linux_=1 -DHAVE_PATHS_H -DIPX_CHANGE -I../include -DDEBUGALL -DCHAPMS=1 -DUSE_CRYPT=1 -DHAVE_CRYPT_H=1 -DMPPE=1 -DHAS_SHADOW -DUSE_PAM -DPLUGIN   -c -o extra_crypto.o extra_crypto.c
extra_crypto.c: In function `DesEncrypt':
extra_crypto.c:141: warning: implicit declaration of function `setkey'
extra_crypto.c:144: warning: implicit declaration of function `encrypt'

gcc -O2 -pipe -Wall -g -D_linux_=1 -DHAVE_PATHS_H -DIPX_CHANGE -I../include -DDEBUGALL -DCHAPMS=1 -DUSE_CRYPT=1 -DHAVE_CRYPT_H=1 -DMPPE=1 -DHAS_SHADOW -DUSE_PAM -DPLUGIN   -c -o chap_ms.o chap_ms.c
chap_ms.c: In function `ChapMS_v2_Auth':
chap_ms.c:328: warning: implicit declaration of function `stpcpy'
chap_ms.c:328: warning: assignment makes pointer from integer without a cast

All these implicit declaration of function warnings, are they normal?