MacOS: Homebrew no longer links openssl headers and libraries into /usr/local.

README.md

@@ -78,7 +78,11 @@ This is the Stackdriver metadata agent.
 
 1. Install runtime dependencies:
 
-       $ brew install boost -c++11 && \
+   *Note: this currently does not work with boost@1.67, which is the latest
+   available from Homebrew as of 2018/05/17*.
+
+       $ brew install openssl
+       $ brew install boost\@1.60 -c++11 && \
          (cd /usr/local/lib && ln -s libboost_thread-mt.a libboost_thread.a && \
           ln -s libboost_thread-mt.dylib libboost_thread.dylib)
        $ brew install yajl

src/Makefile

@@ -31,9 +31,9 @@ SED_EXTRA=-e 's/-Wall/-Wall -Wno-deprecated/'
 
 UNAME_S=$(shell uname -s)
 ifeq ($(UNAME_S),Darwin)
-  CPPFLAGS+= -I/usr/local/include
+  CPPFLAGS+= -I/usr/local/include -I/usr/local/opt/openssl/include
   CXXFLAGS+= -Wno-deprecated-declarations -Wno-c++14-extensions
-  LDFLAGS+= -L/usr/local/lib
+  LDFLAGS+= -L/usr/local/lib -L/usr/local/opt/openssl/lib
   SED_I+= ''
   SED_EXTRA+= -e \
       's/-Wall/-Wall -Wno-deprecated-declarations -Wno-unused-local-typedef/'

test/Makefile

@@ -35,9 +35,9 @@ LDLIBS=\
 
 UNAME_S=$(shell uname -s)
 ifeq ($(UNAME_S),Darwin)
-  CPPFLAGS+= -I/usr/local/include
+  CPPFLAGS+= -I/usr/local/include -I/usr/local/opt/openssl/include
   CXXFLAGS+= -Wno-deprecated-declarations -Wno-c++14-extensions
-  LDFLAGS+= -L/usr/local/lib
+  LDFLAGS+= -L/usr/local/lib -L/usr/local/opt/openssl/lib
 endif
 
 # Where to find code under test.