Configure OPENSSL_LDFLAGS on Darwin

The OPENSSL_LDFLAGS ensures the path is included in the libgit2.pc
file. As standard brew installation doesn't appear to be system wide
on most macOS instances, and you thus have to tell explicitly where
it can be found.

Signed-off-by: Hidde Beydals <hello@hidde.co>

Author: hiddeco

hack/Makefile

@@ -28,8 +28,13 @@ ifeq ($(shell uname -s),Darwin)
 	HAS_BREW := $(shell brew --version 2>/dev/null)
 ifdef HAS_BREW
 HAS_OPENSSL := $(shell brew --prefix openssl@1.1)
+# NB: the OPENSSL_LDFLAGS ensures the path is included in the libgit2.pc
+# file. As standard brew installation doesn't appear to be system wide
+# on most macOS instances, and you thus have to tell explicitly where
+# it can be found.
 ifdef HAS_OPENSSL
 	PKG_CONFIG_PATH := $(PKG_CONFIG_PATH):$(HAS_OPENSSL)/lib/pkgconfig
+	OS_FLAGS += -DOPENSSL_LDFLAGS:STRING=-L $(HAS_OPENSSL)/lib
 else
 	$(warning "Failed to detect openssl@1.1 installation with brew. It can be installed with 'brew install openssl@1.1',")
 	$(warning "or an alternative location can be provided using the PKG_CONFIG_PATH flag, for example:")