make failing in custom code

[Tapas Mishra]

Hi,
I am trying to do a project  when I do a make on project code
in cygwin environment I get following error

gcc -Wall -g -c main.c -o main.o
main.c: In function ‘main’:
main.c:50:8: warning: unused variable ‘physmem’ [-Wunused-variable]
  char *physmem = page_table_get_physmem(pt);
        ^~~~~~~
gcc -Wall -g -c page_table.c -o page_table.o
page_table.c: In function ‘page_table_set_entry’:
page_table.c:125:2: warning: implicit declaration of function
‘remap_file_pages’ [-Wimplicit-function-declaration]
  remap_file_pages(pt->virtmem+page*PAGE_SIZE,PAGE_SIZE,0,frame,0);
  ^~~~~~~~~~~~~~~~
gcc -Wall -g -c disk.c -o disk.o
gcc -Wall -g -c program.c -o program.o
gcc main.o page_table.o disk.o program.o -o virtmem
page_table.o: In function `page_table_set_entry':
/home/DEEL/cs602/try1/page_table.c:125: undefined reference to
`remap_file_pages'
/home/DEEL/cs602/try1/page_table.c:125:(.text+0x491): relocation
truncated to fit: R_X86_64_PC32 against undefined symbol
`remap_file_pages'
collect2: error: ld returned 1 exit status
make: *** [makefile:2: virtmem] Error 1

I compiled the same code on a linux instance hosted on amazon cloud
and it compiled successfully. So this brought me to a conclusion some
files are missing in cygwin and hence I reached here.

so let me know what could be missing. If it is possible to know from
above error The code is mostly signal handling virtual memory
implementation in userspace level and handling of block files etc no
where it deals with kernel etc. So I hope it should work in cygwin
environment.

The code on which make is executing can be read/seen here
disk.c https://pastebin.com/uywHhbKZ
disk.h https://pastebin.com/cXKkDifg

main.c https://pastebin.com/z7xakvz5
page_table.c https://pastebin.com/WpVgB9Fh
page_table.h https://pastebin.com/Lur8uJXN
program.c https://pastebin.com/5giXardt

program.h https://pastebin.com/eiyfSNem
makefile https://pastebin.com/Axi9gtFa
-------
Thanks

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