Special method used to generate x86_64-openbsd 3.2.0 distribution
Starting with release compiler /home/muller/pas/fpc-3.2.0/bin/ppcx64
/home/muller/pas/fpc-3.2.0/bin/ppcx64 -iVDWSOSPTOTP:
3.2.0 2020/10/23 3.2.0 openbsd x86_64 openbsd x86_64
/usr/local/bin/gmake cycle OPT="-n -gl" FPC=/home/muller/pas/fpc-3.2.0/bin/ppcx64 
cp ./ppcx64 /home/muller/pas/release-build/release_3_2_0/fpcsrc/compiler/ppcx64-3.2.0
cp ./ppcx64 ./ppcx64-3.2.0
Generated on machine: OpenBSD gcc220.fsffrance.org 6.8 GENERIC.MP#98 amd64
Starting ./install/makepack x86_64-openbsd
with FPC=/home/muller/pas/release-build/release_3_2_0/fpcsrc/compiler/ppcx64-3.2.0 and EXTRAOPT="-n -gl   -dFPC_USE_LIBC"
Files /home/muller/pas/release-build/release_3_2_0/readme.x86_64-openbsd and fpc-3.2.0.x86_64-openbsd.tar uploaded
Used slightly modifed svn checkout
svn st -q
M       install/install.sh
M       install/makepack
M       fpcsrc/rtl/bsd/sysos.inc
svn diff
Index: install/install.sh
===================================================================
--- install/install.sh	(revision 1528)
+++ install/install.sh	(working copy)
@@ -67,7 +67,12 @@
 # Untar tar.gz file ($2) from file ($1) and untar result to the given directory ($3)
 unztarfromtar ()
 {
- $CMDTAR -xOf "$HERE/$1" "$2" | $TAR -C "$3" -xzf -
+  if [ $is_gnu_tar -eq 1 ] ; then
+    $CMDTAR -xOf "$HERE/$1" "$2" | $TAR -C "$3" -xzf -
+  else
+    $CMDTAR -xf "$HERE/$1" "$2"
+    $TAR -C "$3" -xzf "$2"
+  fi
 }
 
 # Get file list from tar archive ($1) in variable ($2)
Index: install/makepack
===================================================================
--- install/makepack	(revision 1528)
+++ install/makepack	(working copy)
@@ -66,7 +66,7 @@
      fi
  ;;
  *openbsd*) MAKE=gmake
-	EXTRAOPT+=" -Fl/usr/local/lib"
+	EXTRAOPT+=" -Fl/usr/local/lib -dFPC_USE_LIBC"
   ;;
 esac
 
svn diff fpcsrc
Index: fpcsrc/rtl/bsd/sysos.inc
===================================================================
--- fpcsrc/rtl/bsd/sysos.inc	(revision 47157)
+++ fpcsrc/rtl/bsd/sysos.inc	(working copy)
@@ -32,15 +32,7 @@
 function geterrnolocation: Plibcint; cdecl;external clib name '__error';
 {$else}
 {$ifdef OpenBSD}
-
-var libcerrno : libcint; cvar;
-
-function geterrnolocation: Plibcint; cdecl;
-
-begin
- geterrnolocation:=@libcerrno;
-end;
-
+function geterrnolocation: Plibcint; cdecl;external clib name '__errno';
 {$else}
 {$endif}
 {$endif}