An error occurred while compiling pam_mysql.so.

An error occurred while compiling pam_mysql.so -- Linux Enterprise Application-Linux server application information. For more information, see. When using vsftp to implement mysql-based virtual users, the following error occurs when compiling the mysql verification module:
[Root @ localhost pam_mysql] # make
Mkdir-p./dynamic
Gcc-O2-Dlinux-DLINUX_PAM-ansi-D_POSIX_SOURCE-Wall-Wwrite-strings-Wpointer-arith-Wcast-qual-Wcast-align-Wtraditional-Wstrict-prototypes-Wmissing-prototypes- wnested-externs-Winline-Wshadow-pedantic-fPIC-I/usr/local/mysql/include/mysql-DPAM_DYNAMIC-c pam_mysql.c-o dynamic/pam_mysql.o
Pam_mysql.c: 35: 25: Error: mysql/mysql. h: the file or directory does not exist.
Pam_mysql.c: 81: Error: expected '=', ';', 'asm 'or' _ attribute _ 'before' * 'token
Pam_mysql.c: 141: Error: expected ') 'before' *' token
Pam_mysql.c: 143: Error: expected ') 'before' *' token
Pam_mysql.c: 151: Error: expected ') 'before' *' token
Pam_mysql.c: In the 'breakargs 'function:
Pam_mysql.c: 157: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: In the 'parseargs 'function:
Pam_mysql.c: 233: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: At the top layer:
Pam_mysql.c: 391: Error: expected ') 'before' *' token
Pam_mysql.c: In the 'db _ close' function:
Pam_mysql.c: 420: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: 421: Error: 'mysql _ auth' is not declared (used for the first time in this function)
Pam_mysql.c: 421: Error: (even if it appears multiple times in a function, each undeclared identifier
Pam_mysql.c: 421: Error: only one report is reported in the function .)
Pam_mysql.c: 424: Warning: Implicit declaration function 'mysql _ close'
Pam_mysql.c: 424: Warning: External declaration of nesting 'mysql _ close'
Pam_mysql.c: At the top layer:
Pam_mysql.c: 428: Error: expected ') 'before' *' token
Pam_mysql.c: In the 'converse' function:
Pam_mysql.c: 613: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: 617: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: In the 'salance' function:
Pam_mysql.c: 636: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: At the top layer:
Pam_mysql.c: 673: Error: expected ') 'before' *' token
Pam_mysql.c: In the 'askforpassword' function:
Pam_mysql.c: 800: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: At the top layer:
Pam_mysql.c: 839: Error: expected ') 'before' *' token
Pam_mysql.c: In the 'pam _ sm_authenticate 'function:
Pam_mysql.c: 982: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: 989: Error: 'mysql' is not declared (used for the first time in this function)
Pam_mysql.c: 989: Error: expected '; 'before' auth _ SQL _server'
Pam_mysql.c: 1009: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1014: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1019: Warning: Implicit declaration function 'db _ connection'
Pam_mysql.c: 1019: Warning: External declaration of nested 'db _ connect'
Pam_mysql.c: 1019: Error: 'auth _ SQL _server 'is not declared (used for the first time in this function)
Pam_mysql.c: 1027: Warning: Implicit declaration function 'db _ checkpasswd'
Pam_mysql.c: 1027: Warning: External declaration of nested 'db _ checkpasswd'
Pam_mysql.c: In the 'pam _ sm_acct_mgmt 'function:
Pam_mysql.c: 1047: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: In the 'pam _ sm_setcred 'function:
Pam_mysql.c: 1057: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: In the 'pam _ sm_chauthtok 'function:
Pam_mysql.c: 1069: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: 1077: Error: 'mysql' is not declared (used for the first time in this function)
Pam_mysql.c: 1077: Error: expected '; 'before' auth _ SQL _server'
Pam_mysql.c: 1100: Error: 'auth _ SQL _server 'is not declared (used for the first time in this function)
Pam_mysql.c: 1113: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1120: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1147: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1158: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1173: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1180: Warning: leading type dual-off pointers will corrupt the strong overlap rules
Pam_mysql.c: 1187: Warning: Implicit declaration function 'updatepasswd'
Pam_mysql.c: 1187: Warning: External declaration of 'updatepasswd' nesting
Pam_mysql.c: In the 'pam _ sm_open_session 'function:
Pam_mysql.c: 1201: Warning: traditional C does not accept iso c-style function definitions.
Pam_mysql.c: In the 'pam _ sm_close_session 'function:
Pam_mysql.c: 1211: Warning: traditional C does not accept iso c-style function definitions.
Make: *** [dynamic/pam_mysql.o] Error 1

The following is part of the modified Makefile file (the red part is the path of the c header file to be modified and the path of the library file ):
# Convenient defaults for compiling independently of the full source
# Tree.
Ifndef FULL_LINUX_PAM_SOURCE_TREE
Export DYNAMIC =-DPAM_DYNAMIC
Export CC = gcc
Export CFLAGS =-O2-Dlinux-DLINUX_PAM \
-Ansi-D_POSIX_SOURCE-Wall-Wwrite-strings \
-Wpointer-arith-Wcast-qual-Wcast-align-Wtraditional \
-Wstrict-prototypes-Wmissing-prototypes-Wnested-externs-Winline \
-Wshadow-pedantic-fPIC-I/usr/local/mysql/include/mysql
Export MKDIR = mkdir-p
Export LD_D = gcc-shared-Xlinker-x-L/usr/local/mysql/lib/mysql-lz
Endif

I installed mysql in the source code. The above C header file path and library file path are confirmed to be correct. However, Errors still occur during compilation and are depressing. Please help me.