diff --git a/src/Makefile.shlib b/src/Makefile.shlib
index 1e08698b49..b8cbc96b28 100644
--- a/src/Makefile.shlib
+++ b/src/Makefile.shlib
@@ -329,7 +329,11 @@ $(shlib): $(OBJS) | $(SHLIB_PREREQS)
 	rm -f $(stlib)
 	$(LINK.static) $(stlib) $^
 	$(RANLIB) $(stlib)
+ifeq (,$(SHLIB_EXPORTS))
 	$(MKLDEXPORT) $(stlib) $(shlib) >$(exports_file)
+else
+	( echo '#! $(shlib)'; $(AWK) '/^[^#]/ {printf "%s\n",$$1}' $(SHLIB_EXPORTS) ) >$(exports_file)
+endif
 	$(COMPILER) -o $(shlib) $(stlib) -Wl,-bE:$(exports_file) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK)
 	rm -f $(stlib)
 	$(AR) $(AROPT) $(stlib) $(shlib)
diff --git a/src/port/README b/src/port/README
index c446b46e26..97f18a6233 100644
--- a/src/port/README
+++ b/src/port/README
@@ -28,5 +28,5 @@ applications.
 from libpgport are linked first.  This avoids having applications
 dependent on symbols that are _used_ by libpq, but not intended to be
 exported by libpq.  libpq's libpgport usage changes over time, so such a
-dependency is a problem.  Windows, Linux, and macOS use an export list to
-control the symbols exported by libpq.
+dependency is a problem.  Windows, Linux, AIX, and macOS use an export
+list to control the symbols exported by libpq.