pfr SyncTerm has to be as old as NetBSD!
Got to be older than you too, mate. Should you be playing with these old things?
Well, anyway, WTH, here you go:
Install gmake and ncursesw. Apply the patch below.
In the syncterm-1.1/src/syncterm directory run gmake SRC_ROOT=$(cd .. ; pwd)
diff -urN syncterm-1.1.orig/3rdp/build/GNUmakefile syncterm-1.1/3rdp/build/GNUmakefile
--- syncterm-1.1.orig/3rdp/build/GNUmakefile 2020-06-26 23:40:21.000000000 +0000
+++ syncterm-1.1/3rdp/build/GNUmakefile 2021-11-13 07:51:15.065437059 +0000
@@ -67,7 +67,7 @@
$(CRYPT_IDIR): | $(3RDPODIR)
$(QUIET)$(IFNOTEXIST) mkdir $(CRYPT_IDIR)
-$(CRYPTLIB_BUILD): $(3RDP_ROOT)$(DIRSEP)dist/cryptlib.zip $(3RDP_ROOT)$(DIRSEP)build/terminal-params.patch $(3RDP_ROOT)$(DIRSEP)build/cl-mingw32-static.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ranlib.patch $(3RDP_ROOT)$(DIRSEP)build/cl-win32-noasm.patch $(3RDP_ROOT)$(DIRSEP)build/cl-zz-country.patch $(3RDP_ROOT)$(DIRSEP)build/cl-algorithms.patch $(3RDP_ROOT)$(DIRSEP)build/cl-allow-duplicate-ext.patch $(3RDP_ROOT)$(DIRSEP)build/cl-macosx-minver.patch $(3RDP_ROOT)$(DIRSEP)build/cl-endian.patch $(3RDP_ROOT)$(DIRSEP)build/cl-cryptodev.patch $(3RDP_ROOT)$(DIRSEP)build/cl-posix-me-gently.patch $(3RDP_ROOT)$(DIRSEP)build/cl-tpm-linux.patch $(3RDP_ROOT)$(DIRSEP)build/cl-PAM-noprompts.patch $(3RDP_ROOT)$(DIRSEP)build/cl-zlib.patch $(3RDP_ROOT)$(DIRSEP)build/Dynamic-linked-static-lib.patch $(3RDP_ROOT)$(DIRSEP)build/SSL-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-bigger-maxattribute.patch $(3RDP_ROOT)$(DIRSEP)build/cl-vcxproj.patch $(3RDP_ROOT)$(DIRSEP)build/cl-mingw-vcver.patch $(3RDP_ROOT)$(DIRSEP)build/cl-win32-build-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-gcc-non-const-time-val.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-odbc.patch $(3RDP_ROOT)$(DIRSEP)build/cl-noasm-defines.patch $(3RDP_ROOT)$(DIRSEP)build/cl-bn-noasm64-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-RSA-suites.patch $(3RDP_ROOT)$(DIRSEP)build/cl-fix-ECC-RSA.patch $(3RDP_ROOT)$(DIRSEP)build/cl-prefer-ECC.patch $(3RDP_ROOT)$(DIRSEP)build/cl-prefer-ECC-harder.patch $(3RDP_ROOT)$(DIRSEP)build/cl-more-RSA-ECC-fixes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-DH-key-init.patch $(3RDP_ROOT)$(DIRSEP)build/cl-clear-GCM-flag.patch $(3RDP_ROOT)$(DIRSEP)build/cl-use-ssh-ctr.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssh-list-ctr-modes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssh-incCtr.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssl-suite-blocksizes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-tpm.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-via-aes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-fix-ssh-ecc-ephemeral.patch $(3RDP_ROOT)$(DIRSEP)/build/cl-just-use-cc.patch $(3RDP_ROOT)$(DIRSEP)/build/cl-learn-numbers.patch | $(CRYPT_SRC) $(CRYPT_IDIR)
+$(CRYPTLIB_BUILD): $(3RDP_ROOT)$(DIRSEP)dist/cryptlib.zip $(3RDP_ROOT)$(DIRSEP)build/terminal-params.patch $(3RDP_ROOT)$(DIRSEP)build/cl-mingw32-static.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ranlib.patch $(3RDP_ROOT)$(DIRSEP)build/cl-win32-noasm.patch $(3RDP_ROOT)$(DIRSEP)build/cl-zz-country.patch $(3RDP_ROOT)$(DIRSEP)build/cl-algorithms.patch $(3RDP_ROOT)$(DIRSEP)build/cl-allow-duplicate-ext.patch $(3RDP_ROOT)$(DIRSEP)build/cl-macosx-minver.patch $(3RDP_ROOT)$(DIRSEP)build/cl-endian.patch $(3RDP_ROOT)$(DIRSEP)build/cl-cryptodev.patch $(3RDP_ROOT)$(DIRSEP)build/cl-posix-me-gently.patch $(3RDP_ROOT)$(DIRSEP)build/cl-tpm-linux.patch $(3RDP_ROOT)$(DIRSEP)build/cl-PAM-noprompts.patch $(3RDP_ROOT)$(DIRSEP)build/cl-zlib.patch $(3RDP_ROOT)$(DIRSEP)build/Dynamic-linked-static-lib.patch $(3RDP_ROOT)$(DIRSEP)build/SSL-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-bigger-maxattribute.patch $(3RDP_ROOT)$(DIRSEP)build/cl-vcxproj.patch $(3RDP_ROOT)$(DIRSEP)build/cl-mingw-vcver.patch $(3RDP_ROOT)$(DIRSEP)build/cl-win32-build-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-gcc-non-const-time-val.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-odbc.patch $(3RDP_ROOT)$(DIRSEP)build/cl-noasm-defines.patch $(3RDP_ROOT)$(DIRSEP)build/cl-bn-noasm64-fix.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-RSA-suites.patch $(3RDP_ROOT)$(DIRSEP)build/cl-fix-ECC-RSA.patch $(3RDP_ROOT)$(DIRSEP)build/cl-prefer-ECC.patch $(3RDP_ROOT)$(DIRSEP)build/cl-prefer-ECC-harder.patch $(3RDP_ROOT)$(DIRSEP)build/cl-more-RSA-ECC-fixes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-DH-key-init.patch $(3RDP_ROOT)$(DIRSEP)build/cl-clear-GCM-flag.patch $(3RDP_ROOT)$(DIRSEP)build/cl-use-ssh-ctr.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssh-list-ctr-modes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssh-incCtr.patch $(3RDP_ROOT)$(DIRSEP)build/cl-ssl-suite-blocksizes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-tpm.patch $(3RDP_ROOT)$(DIRSEP)build/cl-no-via-aes.patch $(3RDP_ROOT)$(DIRSEP)build/cl-fix-ssh-ecc-ephemeral.patch $(3RDP_ROOT)$(DIRSEP)/build/cl-just-use-cc.patch $(3RDP_ROOT)$(DIRSEP)/build/cl-learn-numbers.patch $(3RDP_ROOT)$(DIRSEP)/build/cl-netbsd-random.patch | $(CRYPT_SRC) $(CRYPT_IDIR)
@echo Creating $@ ...
$(QUIET)-rm -rf $(CRYPT_SRC)/*
$(QUIET)unzip -oa $(3RDPDISTDIR)$(DIRSEP)cryptlib.zip -d $(CRYPT_SRC)
@@ -112,6 +112,7 @@
$(QUIET)patch -p0 -d $(CRYPT_SRC) < cl-fix-ssh-ecc-ephemeral.patch
$(QUIET)patch -p0 -d $(CRYPT_SRC) < cl-just-use-cc.patch
$(QUIET)patch -p0 -d $(CRYPT_SRC) < cl-learn-numbers.patch
+ $(QUIET)patch -p0 -d $(CRYPT_SRC) < cl-netbsd-random.patch
ifeq ($(CC),mingw32-gcc)
$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make directories
$(QUIET)cd $(CRYPT_SRC) && env - PATH="$(PATH)" CC="$(CC)" AR="$(AR)" RANLIB="$(RANLIB)" make toolscripts
diff -urN syncterm-1.1.orig/3rdp/build/cl-netbsd-random.patch syncterm-1.1/3rdp/build/cl-netbsd-random.patch
--- syncterm-1.1.orig/3rdp/build/cl-netbsd-random.patch 1970-01-01 00:00:00.000000000 +0000
+++ syncterm-1.1/3rdp/build/cl-netbsd-random.patch 2021-11-13 07:52:26.277939047 +0000
@@ -0,0 +1,33 @@
+--- random/unix.c.orig 2019-02-28 04:25:18.000000000 +0000
++++ random/unix.c 2021-11-13 07:47:10.711446123 +0000
+@@ -528,8 +528,10 @@
+ /* IPv4 routing table */
+ { 6, { CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0 }, 5 },
+ /* IPv6 routing table */
++#ifndef __NetBSD__
+ { 6, { CTL_NET, AF_ROUTE, 0, AF_INET, NET_RT_FLAGS, RTF_LLINFO }, 5 },
+ /* ARP cache */
++#endif
+
+ /* VM info */
+ #ifdef VM_LOADAVG
+@@ -735,6 +737,11 @@
+ status = initRandomData( randomState, buffer, BIG_RANDOM_BUFSIZE );
+ ENSURES_EXT( cryptStatusOK( status ), 0 );
+
++#ifdef __NetBSD__
++ arc4random_buf( fsstatBuffer, sizeof( fsstatBuffer ) );
++ addRandomData( randomState, fsstatBuffer, sizeof( fsstatBuffer ) );
++ quality = 50; /* surely worth more... */
++#else
+ /* Get statistics for all mounted filesystems, both standard static
+ information and dynamic data like free space, free file inodes,
+ and read/write statistics */
+@@ -749,6 +756,7 @@
+ count * sizeof( struct statfs ) );
+ quality = 3;
+ }
++#endif
+
+ endRandomData( randomState, quality );
+
