--- tests/Makefile.orig	2020-01-12 08:55:32 UTC
+++ tests/Makefile
@@ -30,7 +30,7 @@ email_OBJS = $(OBJDIR)email.o
 	$(CC) -o $(OBJDIR)date$(EXEEXT) $(date_OBJS) $(date_LDFLAGS)
 
 email_OBJS = $(OBJDIR)email.o
-email_CFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CFLAGSF) $(CFLAGS)
+email_CFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CFLAGSF) $(CFLAGS) `pkg-config --cflags openssl`
 email_LDFLAGS = $(LDFLAGSF) $(LDFLAGS) -L$(OBJDIR)../src -Wl,-rpath,$(OBJDIR)../src -lMailer
 
 $(OBJDIR)email$(EXEEXT): $(email_OBJS)