From e8bdbaab228e67b9251baf1fcdae846306cddd59 Mon Sep 17 00:00:00 2001
From: Hiroshi Takekawa <sian.ht@gmail.com>
Date: Wed, 5 Jan 2022 18:25:17 +0900
Subject: [PATCH] Use pkg-config to know where openssl header files reside

Let Makefile know how to locate openssl header files in a directory other than
the default directories by using pkg-config. If you don't have pkg-config, then
$(shell) returns empty.

Signed-off-by: Hiroshi Takekawa <sian.ht@gmail.com>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 7e2773fd..2e3391a2 100644
--- a/Makefile
+++ b/Makefile
@@ -112,6 +112,7 @@ endif
 
 # Use pkg-config to know where libcrypto resides.
 ifneq ($(OS), Darwin)
+  CPPFLAGS += $(shell pkg-config --cflags-only-I openssl)
   LIBS += $(shell pkg-config --libs-only-L openssl) -lcrypto
 endif