commit 75040c3388d9a7dd5ad2bee53cbcc8bf3d35cd17
Author: Honza Horak <hhorak@redhat.com>
Date:   Fri Oct 30 20:16:50 2020 +0100

    The libpq package is supposed to be used for all the PostgreSQL modules
    available in RHEL 8, and ABI versioning will guarantee us that modular RPMs will
    depend on appropriate libpq ABI version (picked at build-time).

diff -ur postgresql-16.1/config/Makefile postgresql_patched/config/Makefile
--- postgresql-16.1/config/Makefile	2023-11-06 23:04:27.000000000 +0100
+++ postgresql_patched/config/Makefile	2023-12-05 10:43:19.733619095 +0100
@@ -8,6 +8,7 @@
 install: all installdirs
 	$(INSTALL_SCRIPT) $(srcdir)/install-sh '$(DESTDIR)$(pgxsdir)/config/install-sh'
 	$(INSTALL_SCRIPT) $(srcdir)/missing '$(DESTDIR)$(pgxsdir)/config/missing'
+	$(INSTALL_SCRIPT) $(srcdir)/build-exports-gnu-ld '$(DESTDIR)$(pgxsdir)/config/build-exports-gnu-ld'

 installdirs:
 	$(MKDIR_P) '$(DESTDIR)$(pgxsdir)/config'
diff -ur postgresql-16.1/src/interfaces/libpq/exports.txt postgresql_patched/src/interfaces/libpq/exports.txt
--- postgresql-16.1/src/interfaces/libpq/exports.txt	2023-11-06 23:04:27.000000000 +0100
+++ postgresql_patched/src/interfaces/libpq/exports.txt	2023-12-05 10:48:24.627604638 +0100
@@ -171,19 +171,19 @@
 PQsslAttribute            169
 PQsetErrorContextVisibility 170
 PQresultVerboseErrorMessage 171
-PQencryptPasswordConn     172
-PQresultMemorySize        173
+PQencryptPasswordConn     172     10
+PQresultMemorySize        173     12
 PQhostaddr                174
 PQgssEncInUse             175
 PQgetgssctx               176
-PQsetSSLKeyPassHook_OpenSSL         177
+PQsetSSLKeyPassHook_OpenSSL         177     13
 PQgetSSLKeyPassHook_OpenSSL         178
 PQdefaultSSLKeyPassHook_OpenSSL     179
-PQenterPipelineMode       180
+PQenterPipelineMode       180       14
 PQexitPipelineMode        181
 PQpipelineSync            182
 PQpipelineStatus          183
 PQsetTraceFlags           184
 PQmblenBounded            185
 PQsendFlushRequest        186
-PQconnectionUsedGSSAPI    187
+PQconnectionUsedGSSAPI    187     16
diff -ur postgresql-16.1/src/Makefile.shlib postgresql_patched/src/Makefile.shlib
--- postgresql-16.1/src/Makefile.shlib	2023-11-06 23:04:27.000000000 +0100
+++ postgresql_patched/src/Makefile.shlib	2023-12-05 10:43:19.739634021 +0100
@@ -185,7 +185,7 @@
   ifdef soname
     LINK.shared		+= -Wl,-soname,$(soname)
   endif
-  BUILD.exports		= ( echo '{ global:'; $(AWK) '/^[^\#]/ {printf "%s;\n",$$1}' $<; echo ' local: *; };' ) >$@
+  BUILD.exports		= $(SHELL) $(top_srcdir)/config/build-exports-gnu-ld < $< > $@
   exports_file		= $(SHLIB_EXPORTS:%.txt=%.list)
   ifneq (,$(exports_file))
     LINK.shared		+= -Wl,--version-script=$(exports_file)
diff --git a/config/build-exports-gnu-ld b/config/build-exports-gnu-ld
new file mode 100755
index 0000000000..84c48e3ade
--- /dev/null
+++ b/config/build-exports-gnu-ld
@@ -0,0 +1,41 @@
+#! /bin/sh
+
+# by default use PG_ prefix
+: "${SYMBOL_VERSION_PREFIX=PG_}"
+
+# we started symbol versioning since v10
+: "${SYMBOL_VERSION_START=9.6}"
+
+version=$SYMBOL_VERSION_START
+version_prev=
+first=:
+
+open_block ()
+{
+       $first || echo
+       first=false
+       echo "${SYMBOL_VERSION_PREFIX}$version {"
+       echo "global:"
+}
+
+close_block ()
+{
+       echo "}${version_prev:+ $SYMBOL_VERSION_PREFIX$version_prev};"
+       version_prev=$version
+       version=$1
+}
+
+open_block
+while read -r symbol _ new_version
+do
+       case $symbol in '#'*) continue ;; esac
+       if test -n "$new_version" && test "$new_version" != "$version"; then
+               close_block "$new_version"
+               open_block
+       fi
+       echo "  $symbol;"
+done
+
+echo "local:"
+echo " *;"
+close_block