diff --git a/makefiles/Makefile.cpp.mk b/makefiles/Makefile.cpp.mk
index 4b29126f92..b2c0ad5560 100644
--- a/makefiles/Makefile.cpp.mk
+++ b/makefiles/Makefile.cpp.mk
@@ -34,6 +34,8 @@ JOBS ?= 4
 # Main target
 .PHONY: cc # Build C++ OR-Tools library.
 .PHONY: test_cc # Run all C++ OR-Tools test targets.
+.PHONY: fz # Build Flatzinc.
+.PHONY: test_fz # Run all Flatzinc test targets.
 
 ortools_libs: $(OR_TOOLS_LIBS)
 ortools-libs: $(OR_TOOLS_LIBS)
@@ -54,7 +56,9 @@ test_cc: \
  test_cc_contrib \
  test_cc_cpp
 
-.PHONY: test_fz
+# Now flatzinc is build with cc
+fz: cc
+
 test_fz: \
  cc \
  rfz_golomb \
diff --git a/makefiles/Makefile.dotnet.mk b/makefiles/Makefile.dotnet.mk
index 060c709b08..94136ccaaf 100644
--- a/makefiles/Makefile.dotnet.mk
+++ b/makefiles/Makefile.dotnet.mk
@@ -18,20 +18,14 @@ else
 	@echo
 endif
 
-# Check for required build tools
-ifeq ($(SYSTEM),win)
-DOTNET_BIN := $(shell $(WHICH) dotnet 2> NUL)
-else # UNIX
-DOTNET_BIN := $(shell $(WHICH) dotnet 2> /dev/null)
-endif
-
 # All libraries and dependencies
 TEMP_DOTNET_DIR = temp_dotnet
 DOTNET_PACKAGE_DIR = temp_dotnet/packages
 DOTNET_PACKAGE_PATH = $(subst /,$S,$(DOTNET_PACKAGE_DIR))
 DOTNET_ORTOOLS_ASSEMBLY_NAME := Google.OrTools
 
-dotnet: $(OR_TOOLS_LIBS)
+.PHONY: dotnet # Build .Net OR-Tools library.
+dotnet: cc
 
 temp_dotnet:
 	mkdir temp_dotnet
@@ -622,7 +616,6 @@ detect_dotnet:
 	@echo Relevant info for the dotnet build:
 	@echo BUILD_DOTNET = $(BUILD_DOTNET)
 	@echo DOTNET_BIN = $(DOTNET_BIN)
-	@echo NUGET_BIN = $(NUGET_BIN)
 	@echo PROTOC = $(PROTOC)
 	@echo DOTNET_SNK = $(DOTNET_SNK)
 	@echo DOTNET_ORTOOLS_SNK = $(DOTNET_ORTOOLS_SNK)
diff --git a/makefiles/Makefile.java.mk b/makefiles/Makefile.java.mk
index 08c809faf9..51f1ed64fd 100644
--- a/makefiles/Makefile.java.mk
+++ b/makefiles/Makefile.java.mk
@@ -34,7 +34,7 @@ JAVA_ORTOOLS_PACKAGE := com.google.ortools
 .PHONY: java_runtime # Build Java OR-Tools runtime.
 .PHONY: java # Build Java OR-Tools.
 .PHONY: test_java # Test Java OR-Tools using various examples.
-java: $(OR_TOOLS_LIBS)
+java: cc
 
 # Detect RuntimeIDentifier
 ifeq ($(OS),Windows)
@@ -456,7 +456,7 @@ else
 endif
 	-$(DELREC) $(TEMP_JAVA_DIR)$Sortools_examples
 
-endif  # BUILD_JAVA=ON	
+endif  # BUILD_JAVA=ON
 
 ################
 ##  Cleaning  ##
diff --git a/makefiles/Makefile.third_party.unix.mk b/makefiles/Makefile.third_party.unix.mk
index 181228f104..878ffae70f 100644
--- a/makefiles/Makefile.third_party.unix.mk
+++ b/makefiles/Makefile.third_party.unix.mk
@@ -5,11 +5,13 @@ help_third_party:
 	@echo
 
 # Checks if the user has overwritten default libraries and binaries.
+BUILD_TYPE ?= Release
 USE_COINOR ?= ON
 USE_SCIP ?= ON
 USE_GLPK ?= OFF
+USE_CPLEX ?= OFF
+USE_XPRESS ?= OFF
 PROTOC ?= $(OR_TOOLS_TOP)/bin/protoc
-BUILD_TYPE ?= Release
 
 # Main target.
 .PHONY: third_party # Build OR-Tools Prerequisite
@@ -30,6 +32,8 @@ dependencies/Makefile: | dependencies
 	-DUSE_COINOR=$(USE_COINOR) \
 	-DUSE_SCIP=$(USE_SCIP) \
 	-DUSE_GLPK=$(USE_GLPK) \
+	-DUSE_CPLEX=$(USE_CPLEX) \
+	-DUSE_XPRESS=$(USE_XPRESS) \
 	-DCMAKE_BUILD_TYPE=$(BUILD_TYPE) \
 	-DCMAKE_INSTALL_PREFIX=$(OR_ROOT_FULL)
 
@@ -47,8 +51,14 @@ clean_third_party:
 .PHONY: detect_third_party # Show variables used to find third party
 detect_third_party:
 	@echo Relevant info on third party:
+	@echo BUILD_TYPE = $(BUILD_TYPE)
+	@echo USE_GLOP = ON
+	@echo USE_PDLP = ON
 	@echo USE_COINOR = $(USE_COINOR)
 	@echo USE_SCIP = $(USE_SCIP)
+	@echo USE_GLPK = $(USE_GLPK)
+	@echo USE_CPLEX = $(USE_CPLEX)
+	@echo USE_XPRESS = $(USE_XPRESS)
 ifdef UNIX_GLPK_DIR
 	@echo UNIX_GLPK_DIR = $(UNIX_GLPK_DIR)
 	@echo GLPK_INC = $(GLPK_INC)
diff --git a/makefiles/Makefile.third_party.win.mk b/makefiles/Makefile.third_party.win.mk
index 8e32da0834..35b2270415 100644
--- a/makefiles/Makefile.third_party.win.mk
+++ b/makefiles/Makefile.third_party.win.mk
@@ -5,17 +5,14 @@ help_third_party:
 	@echo off & echo(
 
 # Checks if the user has overwritten default libraries and binaries.
+BUILD_TYPE ?= Release
 USE_COINOR ?= ON
 USE_SCIP ?= ON
 USE_GLPK ?= OFF
+USE_CPLEX ?= OFF
+USE_XPRESS ?= OFF
 PROTOC = "$(OR_TOOLS_TOP)\\bin\\protoc.exe"
 
-# language targets
-BUILD_PYTHON ?= OFF
-BUILD_JAVA ?= OFF
-BUILD_DOTNET ?= OFF
-BUILD_TYPE ?= Release
-
 # Main target.
 dependencies:
 	mkdir dependencies
@@ -36,8 +33,10 @@ dependencies/ortools.sln: | dependencies
 	-DUSE_COINOR=$(USE_COINOR) \
 	-DUSE_SCIP=$(USE_SCIP) \
 	-DUSE_GLPK=$(USE_GLPK) \
+	-DUSE_CPLEX=$(USE_CPLEX) \
+	-DUSE_XPRESS=$(USE_XPRESS) \
+	-DCMAKE_BUILD_TYPE=$(BUILD_TYPE) \
 	-DCMAKE_INSTALL_PREFIX=$(OR_ROOT_FULL) \
-	-DCMAKE_BUILD_TYPE=Release \
 	-G $(GENERATOR)
 
 .PHONY: clean_third_party
@@ -53,8 +52,14 @@ clean_third_party:
 .PHONY: detect_third_party # Show variables used to find third party
 detect_third_party:
 	@echo Relevant info on third party:
+	@echo BUILD_TYPE = $(BUILD_TYPE)
+	@echo USE_GLOP = ON
+	@echo USE_PDLP = ON
 	@echo USE_COINOR = $(USE_COINOR)
 	@echo USE_SCIP = $(USE_SCIP)
+	@echo USE_GLPK = $(USE_GLPK)
+	@echo USE_CPLEX = $(USE_CPLEX)
+	@echo USE_XPRESS = $(USE_XPRESS)
 ifdef WINDOWS_GLPK_DIR
 	@echo WINDOWS_GLPK_DIR = $(WINDOWS_GLPK_DIR)
 	@echo GLPK_INC = $(GLPK_INC)
diff --git a/makefiles/Makefile.unix.mk b/makefiles/Makefile.unix.mk
index 40d4494dfe..5e939251ed 100644
--- a/makefiles/Makefile.unix.mk
+++ b/makefiles/Makefile.unix.mk
@@ -197,8 +197,8 @@ BUILD_JAVA = OFF
 endif
 
 BUILD_DOTNET ?= ON
-DOTNET := $(shell which dotnet)
-ifeq ($(DOTNET),)
+DOTNET_BIN := $(shell $(WHICH) dotnet 2> /dev/null)
+ifndef DOTNET_BIN
 BUILD_DOTNET=OFF
 endif
 
diff --git a/makefiles/Makefile.win.mk b/makefiles/Makefile.win.mk
index dcfb8070fb..b536b35941 100644
--- a/makefiles/Makefile.win.mk
+++ b/makefiles/Makefile.win.mk
@@ -235,8 +235,8 @@ BUILD_JAVA = OFF
 endif
 
 BUILD_DOTNET ?= ON
-DOTNET := $(shell $(WHICH) dotnet)
-ifeq ($(DOTNET),)
+DOTNET_BIN := $(shell $(WHICH) dotnet 2> NUL)
+ifndef DOTNET_BIN
 BUILD_DOTNET=OFF
 endif