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-rw-r--r--src/interfaces/libpq/Makefile11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c6fe5fec7f6..853aab4b1b8 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -98,14 +98,21 @@ SHLIB_PREREQS = submake-libpgport
SHLIB_EXPORTS = exports.txt
+# Appends to a comma-separated list.
+comma := ,
+define add_to_list
+$(eval $1 := $(if $($1),$($1)$(comma) $2,$2))
+endef
+
ifeq ($(with_ssl),openssl)
-PKG_CONFIG_REQUIRES_PRIVATE = libssl, libcrypto
+$(call add_to_list,PKG_CONFIG_REQUIRES_PRIVATE,libssl)
+$(call add_to_list,PKG_CONFIG_REQUIRES_PRIVATE,libcrypto)
endif
ifeq ($(with_libcurl),yes)
# libpq.so doesn't link against libcurl, but libpq.a needs libpq-oauth, and
# libpq-oauth needs libcurl. Put both into *.private.
-PKG_CONFIG_REQUIRES_PRIVATE += libcurl
+$(call add_to_list,PKG_CONFIG_REQUIRES_PRIVATE,libcurl)
%.pc: override SHLIB_LINK_INTERNAL += -lpq-oauth
endif