build: Add build targets for FreeBSD/amd64

GNUmakefile

@@ -12,7 +12,7 @@ CHECKS ?= --enable goimports
 
 default: help
 
-ifeq (,$(findstring $(THIS_OS),Darwin Linux))
+ifeq (,$(findstring $(THIS_OS),Darwin Linux FreeBSD))
 $(error Building Nomad is currently only supported on Darwin and Linux.)
 endif
 
@@ -36,11 +36,16 @@ ALL_TARGETS += linux_amd64-lxc
 endif
 endif
 
-# On MacOS we only build for MacOS
+# On MacOS, we only build for MacOS
 ifeq (Darwin,$(THIS_OS))
 ALL_TARGETS += darwin_amd64
 endif
 
+# On FreeBSD, we only build for FreeBSD
+ifeq (FreeBSD,$(THIS_OS))
+ALL_TARGETS += freebsd_amd64
+endif
+
 pkg/darwin_amd64/nomad: $(SOURCE_FILES) ## Build Nomad for darwin/amd64
 	@echo "==> Building $@..."
 	@CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 \
@@ -49,6 +54,14 @@ pkg/darwin_amd64/nomad: $(SOURCE_FILES) ## Build Nomad for darwin/amd64
 		-tags "$(GO_TAGS)" \
 		-o "$@"
 
+pkg/freebsd_amd64/nomad: $(SOURCE_FILES) ## Build Nomad for freebsd/amd64
+	@echo "==> Building $@..."
+	@CGO_ENABLED=1 GOOS=freebsd GOARCH=amd64 \
+		go build \
+		-ldflags $(GO_LDFLAGS) \
+		-tags "$(GO_TAGS)" \
+		-o "$@"
+
 pkg/linux_386/nomad: $(SOURCE_FILES) ## Build Nomad for linux/386
 	@echo "==> Building $@..."
 	@CGO_ENABLED=1 GOOS=linux GOARCH=386 \