When I go to compile afkmud 2.1.5 on cygwin. I am using all the packages it says to on the post then some. I have tried using just the packages and still get the same issue.
Here are the errors I get

calendar.cpp: In function ‘char* c_time(time_t, int)’:
calendar.cpp:144:29: error: ‘timezone’ was not declared in this scope
calendar.cpp:157:32: error: ‘localtime’ was not declared in this scope
calendar.cpp:160:30: error: ‘tzname’ was not declared in this scope
calendar.cpp:160:42: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:166:23: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:166:46: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:166:62: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:166:78: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:19: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:46: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:68: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:90: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:106: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:121: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:167:136: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp: In function ‘char* mini_c_time(time_t, int)’:
calendar.cpp:185:29: error: ‘timezone’ was not declared in this scope
calendar.cpp:198:32: error: ‘localtime’ was not declared in this scope
calendar.cpp:201:30: error: ‘tzname’ was not declared in this scope
calendar.cpp:201:42: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:206:20: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:210:63: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:210:82: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:19: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:46: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:68: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:90: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:106: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
calendar.cpp:211:121: error: invalid use of incomplete type ‘struct tm’
/usr/include/wchar.h:46:8: error: forward declaration of ‘struct tm’
Makefile:169: recipe for target `o/calendar.o' failed
make[1]: *** [o/calendar.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:106: recipe for target `all' failed
make: *** [all] Error 2

Thank you guys for making a great mud base, have used it before in the past. But any help here is greatly appreciated.

To fix this in cygwin, I added the following in the include section of the files calender.cpp, connhist.cpp, and mud_comm.cpp:

#include "time.h"

I recently have been trying to port afkmud over to cygwin. Ran into a similar error.

Building AFKMud....
/usr/bin/make -j2 -s afkmud
Compiling o/act_comm.o....
Compiling o/act_wiz.o....
Compiling o/area.o....
Compiling o/auction.o....
Compiling o/builder.o....
Compiling o/character.o....
Compiling o/clans.o....
Compiling o/comm.o....
Compiling o/commands.o....
commands.cpp: In function ‘void start_timer(timeval*)’:
commands.cpp:180:34: error: ‘gettimeofday’ was not declared in this scope
commands.cpp: In function ‘time_t end_timer(timeval*)’:
commands.cpp:186:19: error: aggregate ‘timeval etime’ has incomplete type and cannot be defined
commands.cpp:191:31: error: ‘gettimeofday’ was not declared in this scope
commands.cpp:192:34: error: invalid use of incomplete type ‘struct timeval’
commands.cpp:62:29: error: forward declaration of ‘struct timeval’
commands.cpp:192:56: error: invalid use of incomplete type ‘struct timeval’
commands.cpp:62:29: error: forward declaration of ‘struct timeval’
commands.cpp: In function ‘void interpret(char_data*, std::string)’:
commands.cpp:456:19: error: aggregate ‘timeval time_used’ has incomplete type and cannot be defined
commands.cpp: In function ‘void do_timecmd(char_data*, std::string)’:
commands.cpp:1914:19: error: aggregate ‘timeval starttime’ has incomplete type and cannot be defined
commands.cpp:1915:19: error: aggregate ‘timeval endtime’ has incomplete type and cannot be defined
commands.cpp:1942:35: error: ‘gettimeofday’ was not declared in this scope
commands.cpp: In function ‘time_t end_timer(timeval*)’:
commands.cpp:203:1: warning: control reaches end of non-void function
make[1]: *** [o/commands.o] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:169: recipe for target `o/commands.o' failed
Makefile:106: recipe for target `all' failed
make: *** [all] Error 2


BUILD FAILED (exit value 2, total time: 18s)


any help?

Did you try the above recommendation, including time.h?

time.h was already included

it needed to be #include

Fixed!