vcpkg/ports/libpq/unix/single-linkage.patch

diff --git a/src/Makefile.shlib b/src/Makefile.shlib
index 551023c..16255d7 100644
--- a/src/Makefile.shlib
+++ b/src/Makefile.shlib
@@ -260,10 +260,14 @@ endif
 
 .PHONY: all-lib all-static-lib all-shared-lib
 
+ifndef LIBPQ_LIBRARY_TYPE
 all-lib: all-shared-lib
 ifdef soname
 # no static library when building a dynamically loadable module
 all-lib: all-static-lib
+endif
+else
+all-lib: all-$(LIBPQ_LIBRARY_TYPE)-lib
 all-lib: lib$(NAME).pc
 endif
 
@@ -417,9 +421,13 @@ endif # PORTNAME == cygwin || PORTNAME == win32
 ##
 
 .PHONY: install-lib install-lib-static install-lib-shared installdirs-lib
+ifndef LIBPQ_LIBRARY_TYPE
 install-lib: install-lib-shared
 ifdef soname
 install-lib: install-lib-static
+endif
+else
+install-lib: install-lib-$(LIBPQ_LIBRARY_TYPE)
 install-lib: install-lib-pc
 endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 8abdb09..185461e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -115,6 +115,7 @@ backend_src = $(top_srcdir)/src/backend
 # Also skip the test on platforms where libpq infrastructure may be provided
 # by statically-linked libraries, as we can't expect them to honor this
 # coding rule.
+ifeq ($(LIBPQ_LIBRARY_TYPE), shared)
 libpq-refs-stamp: $(shlib)
 ifneq ($(enable_coverage), yes)
 ifeq (,$(filter aix solaris,$(PORTNAME)))
@@ -124,6 +125,10 @@ ifeq (,$(filter aix solaris,$(PORTNAME)))
 endif
 endif
 	touch $@
+else
+.PHONY: libpq-refs-stamp
+libpq-refs-stamp:
+endif
 
 # Make dependencies on pg_config_paths.h visible in all builds.
 fe-connect.o: fe-connect.c $(top_builddir)/src/port/pg_config_paths.h