Hi Shubham,

mktime() converts a struct tm interpreted as local time to time_t, while timegm() converts a struct tm interpreted as UTC to time_t.  The result is different.

Otherwise, I'd gladly merge your patch is you declare it public domain.  Would you update the patch to convert to local time?

Best regards,
    Mike

Hi,

Sorry for the wrong patch. I have attached the corrected one in this email.

Thanks,
Shubham

---------- Forwarded message ---------
From: shubham gupta <shubham17031994@gmail.com>
Date: Thu, Feb 26, 2026 at 2:55 PM
Subject: timegm not supported in AIX
To: <stunnel-users@stunnel.org>

Hi,

I am building the latest stunnel on an AIX machine. However I see build failure due to missing API timegm.
Snippet from the error generating file src/oscp.c
#ifdef _WIN32
        return _mkgmtime(&tm);
#else /* defined _WIN32 */
        return timegm(&tm);
#endif /* defined _WIN32 */

Error log:

libtool: link: /opt/freeware/bin/gcc -maix64 -O2 -DOPENSSL_NO_PSK -g -O2 -Wall -Wextra -Wpedantic -Wformat=2 -Wconversion -Wno-deprecated-declarations -Wno-unused-command-line-argument -fPIE -D_FORTIFY_SOURCE=2 -Wl,-blibpath:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib -fPIE -pie -o stunnel stunnel-tls.o stunnel-str.o stunnel-file.o stunnel-client.o stunnel-log.o stunnel-options.o stunnel-protocol.o stunnel-network.o stunnel-resolver.o stunnel-ssl.o stunnel-ctx.o stunnel-verify.o stunnel-sthreads.o stunnel-ocsp.o stunnel-fd.o stunnel-dhparam.o stunnel-cron.o stunnel-stunnel.o stunnel-pty.o stunnel-libwrap.o stunnel-ui_unix.o  -L/usr/lib -lssl -lcrypto -L/opt/freeware/lib64 -L/opt/freeware/lib -lpthread
ld: 0711-317 ERROR: Undefined symbol: .timegm


Please consider the patch attached along with the email for fixing the issue.

Thanks,
Shubham

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