I did this

Build 7.74.0 on IBM i V7R3M0

Command > CRTCMOD MODULE(CURLLIB/CCSIDCURL) SRCSTMF('/curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c') SYSIFCOPT(*IFS64IO) OPTION(*INCDIRFIRST) LOCALETYPE(*LOCALE) FLAG(10) INCDIR('/qibm/proddata/qadrt/include' '/curl/src/curl-7.74.0/include/curl' '/curl/src/curl-7.74.0/include' '/curl/src/curl-7.74.0/packages/OS400' '/curl/src/curl-7.74.0/packages/OS400' '/curl/src/curl-7.74.0/lib') TGTCCSID(37) TGTRLS(*CURRENT) OUTPUT(*NONE) OPTIMIZE(40) DBGVIEW(*NONE) DEFINE( BUILDING_LIBCURL) <
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1061.17: CZM0275(30) Unexpected text ')' encountered.
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1061.8: CZM0045(30) Undeclared identifier cfcdata.
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1061.22: CZM0277(30) Syntax error: possible missing ')' or ','?
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1088.11: CZM0275(30) Unexpected text lcfc encountered.
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1088.3: CZM0045(30) Undeclared identifier cfcdata.
CZM1003: /curl/src/curl-7.74.0/packages/OS400/ccsidcurl.c, 1090.3: CZM0045(30) Undeclared identifier lcfc.
CZS0601: Module CCSIDCURL is not created because statement errors occurred.
CZM0613: The compilation failed.

I believe cfcdata declarations and casts need to be qualified with a 'struct' on lines 1056, 1061 and 1088.

I expected the following

Clean build

curl/libcurl version

7.74.0

operating system

IBM i V7R3M0