here is a mistake in official file gen_kpp.c, their gen_kpp.c 's function definition order is reserved! So when you make there is a report of error:implicit function: write_list_to_screen,screen_out,check_all 官方很多WRF版本的chem下面的/chem/KPP/util/wkc/gen_kpp.c都是錯的（直到2023.4.27最新版的WRF裡面的這個都還是錯的），因為他把函式順序給放反了，把write_list_to_screen跟screen_out還有check_all都放在最下面了，而gen_kpp函式卻放在最上面，所以就會導致報錯函式沒有定義，因此需要將原檔案裡面的函式順序換一下，把write_list_to_screen等3個函式放到gen_kpp的上面，在我的這裡是已經修改好的gen_kpp.c檔案，下載後替換即可 error like this: gcc -I../../../../inc -c -g gen_kpp.c gen_kpp.c: In function ‘gen_kpp’: gen_kpp.c:75:27: warning: implicit declaration of function ‘write_list_to_screen ’ [-Wimplicit-function-declaration] 75 | if ( DEBUGR == 2 ) write_list_to_screen( WRFC_packs ) ; | ^~~~~~~~~~~~~~~~~~~~ gen_kpp.c:115:6: warning: implicit declaration of function ‘screen_out’ [-Wimpli cit-function-declaration] 115 | screen_out( ); | ^~~~~~~~~~ gen_kpp.c:120:6: warning: implicit declaration of function ‘check_all’ [-Wimplic it-function-declaration] 120 | check_all ( kpp_dirname ); | ^~~~~~~~~
The /chem/KPP/util/wkc/gen_kpp.c under the chem of many official WRF versions is wrong (this is still wrong in the latest version of WRF until 2023.4.27), because the order of functions is reversed , put write_list_to_screen, screen_out and check_all at the bottom, but put the gen_kpp function at the top, so it will cause the error functions are implicit declaration, so you need to change the order of the functions in the original file, please put 'write_list_to_screen' 'screen_out','check_all' over top of gen_kpp. Here is the modified correct gen_kpp.c file in my github, you can use it.