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I'm having the same issue as Martchus.

• No custom compilation flags in /etc/makepkg.conf
• Python 3.7.3

I can't reproduce your error. Do you have custom compilation flags on /etc/makepkg.conf? If so which ones? what's your default python version?

It doesn't compile due to some warnings treated as errors:

make[3]: Entering directory '/build/openswan/src/openswan-2.6.51.5/OBJ.linux.x86_64/programs/tncfg'
which: no xmlto in (/usr/lib/ccache/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)
CC tncfg.c
In file included from /usr/include/string.h:494,
                 from /build/openswan/src/openswan-2.6.51.5/programs/tncfg/tncfg.c:19:
In function ‘strncpy’,
    inlined from ‘main’ at /build/openswan/src/openswan-2.6.51.5/programs/tncfg/tncfg.c:233:4:
/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound 16 equals destination size [-Werror=stringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncpy’,
    inlined from ‘main’ at /build/openswan/src/openswan-2.6.51.5/programs/tncfg/tncfg.c:236:4:
/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound 12 equals destination size [-Werror=stringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [/build/openswan/src/openswan-2.6.51.5/Makefile.common:21: tncfg.o] Error 1

@lonaowna Done :)

Please add conflicts=('strongswan')

I've been having trouble with this version (2.6.49) failing to re-key. Connects ok initially but then the tunnel fails when the keylife expires.
xelerance has released a 2.6.49.1 version. I'm now running that and the tunnel seems stable.
You might want to update the package to the new version.

Note that the package cannot install to the /run directory. Remove the entire $pkgdir/var directory and add the following two lines to the [Service] section of the openswan.service file:

RuntimeDirectory=pluto
RuntimeDirectoryMode=0700

Also, the usr/share/man/man3 directory is empty, remove it in package()

Note that the update to 2.6.49 commit is still stuck at 2.6.47.

options=(!makeflags) should be added to the makefile, since setting -j n is very common.

Please revert 2.6.43.1

Notice from the website:
"If you have downloaded version 2.6.45 or 2.6.44, please revert to version 2.6.43.1, as 2.6.44 and 2.6.45 have been found to be unstable in certain environments. We are working on a fix."