diff --git a/Makefile b/Makefile
index 205c9ae46c..0608ebc6ed 100755
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,18 @@
 # Top level declarations
-help:
-	@echo Please define target:
-	@echo "  - Prerequisite: third_party third_party_check clean_third_party"
-	@echo "  - C++: cc help_cc test_cc clean_cc"
-	@echo "  - Python: python help_python test_python clean_python"
-	@echo "  - Java: java help_java test_java clean_java"
-	@echo "  - .NET (CSharp): csharp help_csharp test_csharp clean_csharp"
-	@echo "  - .NET (FSharp): fsharp help_fsharp test_fsharp clean_fsharp"
-	@echo "  - all: all test clean"
-	@echo "  - detect: detect_port detect_python detect_java detect_csharp detect_fsharp"
+.PHONY: help
+help: help_all
+
+.PHONY: all
+all: build_all
+
+.PHONY: test
+test: test_all
+
+.PHONY: clean
+clean: clean_all
+
+.PHONY: detect
+detect: detect_all
 
 # OR_ROOT is the minimal prefix to define the root of or-tools, if we
 # are compiling in the or-tools root, it is empty. Otherwise, it is
@@ -30,13 +34,6 @@ else
   endif
 endif
 
-.PHONY : help cc python java csharp fsharp sat
-all: third_party_check cc java python csharp fsharp
-	@echo Or-tools have been built for $(BUILT_LANGUAGES)
-
-.PHONY: clean
-clean: clean_cc clean_java clean_python clean_csharp clean_compat clean_fsharp
-
 # Read version.
 include $(OR_ROOT)Version.txt
 
@@ -69,14 +66,32 @@ include $(OR_ROOT)makefiles/Makefile.test.mk
 # Finally include user makefile if it exists
 -include $(OR_ROOT)Makefile.user
 
-#check if "make third_party" have been run or not
-.PHONY: third_party_check
-third_party_check:
-ifeq ($(wildcard dependencies/install/include/gflags/gflags.h),)
-	@echo "One of the third party files was not found! did you run 'make third_party'?" && exit 1
-endif
+.PHONY: help_usage
+help_usage:
+	@echo Use one of the following targets:
+	@echo help, help_all:	Print this help.
+	@echo all:	Build OR-Tools for all available languages \(need a call to \"make third_party\" first\).
+	@echo test, test_all:	Test OR-Tools for all available languages.
+	@echo clean, clean_all:	Clean output from previous build for all available languages \(won\'t clean third party\).
+	@echo detect, detect_all:	Show variables used to build OR-Tools for all available languages.
+	@echo ""
 
-.PHONY: detect
-detect: detect_port detect_cc detect_python detect_java detect_csharp detect_fsharp
+.PHONY: help_all
+help_all: help_usage help_third_party help_cc help_python help_java help_csharp help_fsharp
+
+.PHONY: build_all
+build_all: cc python java csharp fsharp
+	@echo Or-tools have been built for $(BUILT_LANGUAGES)
+
+.PHONY: test_all
+test_all: test_cc test_python test_java test_csharp test_fsharp
+	@echo Or-tools have been built and tested for $(BUILT_LANGUAGES)
+
+.PHONY: clean_all
+clean_all: clean_cc clean_python clean_java clean_csharp clean_compat clean_fsharp
+	@echo Or-tools have been cleaned for $(BUILT_LANGUAGES)
+
+.PHONY: detect_all
+detect_all: detect_port detect_cc detect_python detect_java detect_csharp detect_fsharp
 
 print-%  : ; @echo $* = $($*)
diff --git a/makefiles/Makefile.cpp.mk b/makefiles/Makefile.cpp.mk
index 8945b16f4c..c3de71c7af 100755
--- a/makefiles/Makefile.cpp.mk
+++ b/makefiles/Makefile.cpp.mk
@@ -1,7 +1,7 @@
 # ---------- C++ support ----------
-.PHONY: help_cc # Generate list of targets with descriptions.
+.PHONY: help_cc # Generate list of C++ targets with descriptions.
 help_cc:
-	@echo Use one of the following targets:
+	@echo Use one of the following C++ targets:
 ifeq ($(SYSTEM),win)
 	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.cpp.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
 else
@@ -12,7 +12,7 @@ endif
 
 # Main target
 .PHONY: cc # Build C++ OR-Tools.
-cc: ortoolslibs ccexe
+cc: third_party_check ortoolslibs ccexe
 .PHONY: test_cc # Test C++ OR-Tools using various examples.
 test_cc: test_cc_examples
 BUILT_LANGUAGES += C++
diff --git a/makefiles/Makefile.csharp.mk b/makefiles/Makefile.csharp.mk
index 2e8ee704e2..fe4e240cfc 100755
--- a/makefiles/Makefile.csharp.mk
+++ b/makefiles/Makefile.csharp.mk
@@ -1,7 +1,7 @@
 # ---------- CSharp support using SWIG ----------
-.PHONY: help_csharp # Generate list of targets with descriptions.
+.PHONY: help_csharp # Generate list of C# targets with descriptions.
 help_csharp:
-	@echo Use one of the following targets:
+	@echo Use one of the following C# targets:
 ifeq ($(SYSTEM),win)
 	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.csharp.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
 else
diff --git a/makefiles/Makefile.fsharp.mk b/makefiles/Makefile.fsharp.mk
index a7bbb0f2a9..1903dbdeaf 100644
--- a/makefiles/Makefile.fsharp.mk
+++ b/makefiles/Makefile.fsharp.mk
@@ -1,7 +1,7 @@
 # ---------- FSharp support using SWIG ----------
-.PHONY: help_fsharp # Generate list of targets with descriptions.
+.PHONY: help_fsharp # Generate list of F# targets with descriptions.
 help_fsharp:
-	@echo Use one of the following targets:
+	@echo Use one of the following F# targets:
 ifeq ($(SYSTEM),win)
 	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.fsharp.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
 else
diff --git a/makefiles/Makefile.java.mk b/makefiles/Makefile.java.mk
index aa9bbc588a..c2e9b8b7e8 100755
--- a/makefiles/Makefile.java.mk
+++ b/makefiles/Makefile.java.mk
@@ -1,7 +1,7 @@
 # ---------- Java support using SWIG ----------
-.PHONY: help_java # Generate list of targets with descriptions.
+.PHONY: help_java # Generate list of Java targets with descriptions.
 help_java:
-	@echo Use one of the following targets:
+	@echo Use one of the following Java targets:
 ifeq ($(SYSTEM),win)
 	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.java.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
 else
diff --git a/makefiles/Makefile.python.mk b/makefiles/Makefile.python.mk
index acd89e1fc8..d32ca83998 100755
--- a/makefiles/Makefile.python.mk
+++ b/makefiles/Makefile.python.mk
@@ -1,7 +1,7 @@
 # ---------- Python support using SWIG ----------
-.PHONY: help_python # Generate list of targets with descriptions.
+.PHONY: help_python # Generate list of Python targets with descriptions.
 help_python:
-	@echo Use one of the following targets:
+	@echo Use one of the following Python targets:
 ifeq ($(SYSTEM),win)
 	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.python.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
 else
diff --git a/makefiles/Makefile.test.mk b/makefiles/Makefile.test.mk
index cbcaf161ad..8d0d67bf83 100755
--- a/makefiles/Makefile.test.mk
+++ b/makefiles/Makefile.test.mk
@@ -1,7 +1,5 @@
-.PHONY: test
-test: test_cc test_python test_java test_csharp test_fsharp
-	@echo Or-tools have been built and tested for $(BUILT_LANGUAGES)
-
+# Targets to run tests
+.PHONY: test_cc_examples
 test_cc_examples: cc
 	$(BIN_DIR)$Sgolomb$E --size=5
 	$(BIN_DIR)$Scvrptw$E
@@ -10,6 +8,7 @@ test_cc_examples: cc
 	$(BIN_DIR)$Sinteger_programming$E
 	$(BIN_DIR)$Stsp$E
 
+.PHONY: test_python_examples
 test_python_examples: python
 	$(SET_PYTHONPATH) $(PYTHON_EXECUTABLE) $(EX_DIR)$Spython$Shidato_table.py
 	$(SET_PYTHONPATH) $(PYTHON_EXECUTABLE) $(EX_DIR)$Spython$Stsp.py
@@ -21,11 +20,13 @@ test_python_examples: python
 	$(SET_PYTHONPATH) $(PYTHON_EXECUTABLE) $(EX_DIR)$Stests$Stest_cp_api.py
 	$(SET_PYTHONPATH) $(PYTHON_EXECUTABLE) $(EX_DIR)$Stests$Stest_lp_api.py
 
+.PHONY: test_java_examples
 test_java_examples: java run_RabbitsPheasants run_FlowExample \
 run_Tsp run_LinearProgramming run_IntegerProgramming \
 run_Knapsack run_MultiThreadIntegerProgramming
 
 # csharp test
+.PHONY: test_csharp_examples
 test_csharp_examples: \
 		$(CSHARPEXE) \
 		$(BIN_DIR)/testlp$(CLR_EXE_SUFFIX).exe \
@@ -49,5 +50,6 @@ test_csharp_examples: \
 	$(MONO) $(BIN_DIR)$Stestcp$(CLR_EXE_SUFFIX).exe
 	$(MONO) $(BIN_DIR)$Stest_sat_model$(CLR_EXE_SUFFIX).exe
 
+.PHONY: test_fsharp_examples
 test_fsharp_examples: fsharp
 	$(warning F# tests unimplemented)
diff --git a/makefiles/Makefile.third_party.unix.mk b/makefiles/Makefile.third_party.unix.mk
index d038b2f6c6..edcb891cb9 100644
--- a/makefiles/Makefile.third_party.unix.mk
+++ b/makefiles/Makefile.third_party.unix.mk
@@ -1,5 +1,9 @@
-# SVN tags of dependencies to checkout.
+.PHONY: help_third_party # Generate list of Prerequisite targets with descriptions.
+help_third_party:
+	@echo Use one of the following Prerequisite targets:
+	@grep "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.third_party.unix.mk | sed "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/" | expand -t20
 
+# Tags of dependencies to checkout.
 GFLAGS_TAG = 2.2.1
 PROTOBUF_TAG = 3.5.1
 GLOG_TAG = 0.3.5
@@ -16,11 +20,16 @@ ifeq ($(PLATFORM), MACOSX)
 endif
 
 # Main target.
-.PHONY: makefile_third_party missing_directories
+.PHONY: third_party # Build OR-Tools Prerequisite
 third_party: makefile_third_party install_third_party
 
-# Create missing directories
+.PHONY: third_party_check # Check if "make third_party" have been run or not
+third_party_check:
+ifeq ($(wildcard dependencies/install/include/gflags/gflags.h),)
+	@echo "One of the third party files was not found! did you run 'make third_party'?" && exit 1
+endif
 
+# Create missing directories
 MISSING_DIRECTORIES = \
 	dependencies/install \
 	dependencies/archives \
@@ -58,6 +67,7 @@ MISSING_DIRECTORIES = \
 	ortools/gen/ortools/linear_solver \
 	ortools/gen/ortools/sat
 
+.PHONY: makefile_third_party missing_directories
 missing_directories: $(MISSING_DIRECTORIES)
 
 install_third_party: \
@@ -258,9 +268,7 @@ dependencies/sources/patchelf-$(PATCHELF_TAG)/configure:
 	git clone --quiet -b $(PATCHELF_TAG) https://github.com/NixOS/patchelf.git dependencies/sources/patchelf-$(PATCHELF_TAG)
 	cd dependencies/sources/patchelf-$(PATCHELF_TAG) && ./bootstrap.sh
 
-
 # Install Java protobuf
-
 dependencies/install/lib/protobuf.jar: dependencies/install/bin/protoc
 	cd dependencies/sources/protobuf-$(PROTOBUF_TAG)/java && \
 	  ../../../install/bin/protoc --java_out=core/src/main/java -I../src \
@@ -271,7 +279,8 @@ dependencies/install/lib/protobuf.jar: dependencies/install/bin/protoc
 # Install C# protobuf
 
 #create .snk file if strong named dll is required (this is the default behaviour)
-# Clean everything.
+
+.PHONY: clean_third_party # Clean everything. Remember to also delete archived dependencies, i.e. in the event of download failure, etc.
 clean_third_party:
 	-$(DEL) Makefile.local
 	-$(DELREC) dependencies/archives/Cbc*
diff --git a/makefiles/Makefile.third_party.win.mk b/makefiles/Makefile.third_party.win.mk
index c8342a4e72..8d4d7db520 100644
--- a/makefiles/Makefile.third_party.win.mk
+++ b/makefiles/Makefile.third_party.win.mk
@@ -1,3 +1,8 @@
+.PHONY: help_third_party # Generate list of Prerequisite targets with descriptions.
+help_third_party:
+	@echo Use one of the following Prerequisite targets:
+	@tools\grep.exe "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.third_party.win.mk | tools\sed.exe "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/"
+
 # tags of dependencies to checkout.
 GFLAGS_TAG = 2.2.1
 PROTOBUF_TAG = 3.5.1
@@ -11,11 +16,16 @@ SWIG_TAG = 3.0.12
 TSVNCACHE_EXE = TSVNCache.exe
 
 # Main target.
-.PHONY: third_party build_third_party makefile_third_party
+.PHONY: third_party # Build OR-Tools Prerequisite
 third_party: build_third_party makefile_third_party
 
-# Create missing directories
+.PHONY: third_party_check # Check if "make third_party" have been run or not
+third_party_check:
+ifeq ($(wildcard dependencies/install/include/gflags/gflags.h),)
+	@echo "One of the third party files was not found! did you run 'make third_party'?" && exit 1
+endif
 
+# Create missing directories
 MISSING_DIRECTORIES = \
 	bin \
 	lib \
@@ -53,6 +63,7 @@ MISSING_DIRECTORIES = \
 
 missing_directories: $(MISSING_DIRECTORIES)
 
+.PHONY: build_third_party
 build_third_party: \
 	install_directories \
 	archives_directory \
@@ -353,7 +364,7 @@ kill_tortoisesvn_cache:
 remove_readonly_svn_attribs: kill_tortoisesvn_cache
 	if exist dependencies\sources\* $(ATTRIB) -r /s dependencies\sources\*
 
-# Clean everything. Remember to also delete archived dependencies, i.e. in the event of download failure, etc.
+.PHONY: clean_third_party # Clean everything. Remember to also delete archived dependencies, i.e. in the event of download failure, etc.
 clean_third_party: remove_readonly_svn_attribs
 	-$(DEL) Makefile.local
 	-$(DEL) dependencies\archives\swigwin*.zip
@@ -374,6 +385,7 @@ clean_third_party: remove_readonly_svn_attribs
 	-$(DELREC) dependencies\install
 
 # Create Makefile.local
+.PHONY: makefile_third_party
 makefile_third_party: Makefile.local
 
 # Make sure that local file lands correctly across platforms