diff --git a/owlps-positioning/Makefile b/owlps-positioning/Makefile
index 05649d4..5545c48 100644
--- a/owlps-positioning/Makefile
+++ b/owlps-positioning/Makefile
@@ -1,5 +1,9 @@
-.PHONY : all test doc clean purge install uninstall style check
+# Source version
+ifndef OWLPS_VERSION
+	OWLPS_VERSION = $$(git describe || echo 'UNKNOWN_VERSION')
+endif
 
+# Directories & files
 SRC_DIR = src
 OBJ_DIR = obj
 TESTS_DIR = tests
@@ -8,7 +12,7 @@ DOXYFILE = Doxyfile
 
 # Installation directory
 PREFIX = /usr/local
-INSTALL_DIR =  $(PREFIX)/bin
+INSTALL_DIR = $(PREFIX)/bin
 
 # System tools
 RM = rm -fv
@@ -36,8 +40,11 @@ GXXFLAGS = $(DEBUG) -Wall -Wextra -I$(LIBOWLPS_DIR)
 LD = $(CXX)
 LDFLAGS = -lstdc++ -lm -lrt -lboost_program_options \
 	-L$(LIBOWLPS_DIR) -lowlps
+OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
 
 # Targets
+.PHONY : all test doc clean purge install uninstall style check
+
 TARGET = owlps-positioning
 OBJ_TARGET = $(OBJ_DIR)/$(TARGET).o
 SOURCE_TARGET = $(SRC_DIR)/$(TARGET).cc
@@ -120,7 +127,7 @@ $(TESTS_DIR)/%.o: $(TESTS_DIR)/%.cc $(TESTS_DIR)/%.hh
 	$(CXX) $(GXXFLAGS) $(TESTSGXXFLAGS) -o $@ -c $<
 
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.cc $(SRC_DIR)/%.hh
-	$(MKDIR) $(OBJ_DIR) && $(CXX) $(GXXFLAGS) -o $@ -c $<
+	$(MKDIR) $(OBJ_DIR) && $(CXX) $(GXXFLAGS) $(OWLPSFLAGS) -o $@ -c $<
 
 %: $(OBJ_DIR)/%.o
 	$(LD) $(LDFLAGS) -o $@ $^
diff --git a/owlps-positioning/src/userinterface.cc b/owlps-positioning/src/userinterface.cc
index ca0a309..4e96d09 100644
--- a/owlps-positioning/src/userinterface.cc
+++ b/owlps-positioning/src/userinterface.cc
@@ -72,10 +72,11 @@ void UserInterface::fill_options()
 void UserInterface::fill_cli_options()
 {
   cli_options->add_options()
-  ("help,h", "Print help")
+  ("help,h", "Print help.")
+  ("version,V", "Print version information.")
   ("config-file,f", po::value<string>()
    ->default_value(DEFAULT_CONFIG_FILE_NAME),
-   "Alternative configuration file")
+   "Alternative configuration file.")
   ; // End of options
 }
 
@@ -214,7 +215,7 @@ void UserInterface::fill_misc_options()
 void UserInterface::parse_options()
 {
   parse_command_line() ;
-  print_usage_and_exit_if_requested() ;
+  print_information_and_exit_if_requested() ;
 
   parse_file() ;
 
@@ -231,13 +232,34 @@ void UserInterface::parse_command_line() const
 }
 
 
-void UserInterface::print_usage_and_exit_if_requested() const
+void UserInterface::print_information_and_exit_if_requested() const
 {
+  bool exit_program = false ;
+
+  // Print version if requested
+  if (Configuration::is_configured("version"))
+    {
+      cout
+          << "This is OwlPS Positioning, part of the Open Wireless"
+          << " Positioning System project.\nVersion: " <<
+#ifdef OWLPS_VERSION
+          OWLPS_VERSION
+#else // OWLPS_VERSION
+          "unknown version"
+#endif // OWLPS_VERSION
+          << ".\n" ;
+      exit_program = true ;
+    }
+
+  // Print usage if requested
   if (Configuration::is_configured("help"))
     {
       cout << *cli_options ;
-      exit(0) ;
+      exit_program = true ;
     }
+
+  if (exit_program)
+    exit(0) ;
 }
 
 
diff --git a/owlps-positioning/src/userinterface.hh b/owlps-positioning/src/userinterface.hh
index c57bfd8..bf0890e 100644
--- a/owlps-positioning/src/userinterface.hh
+++ b/owlps-positioning/src/userinterface.hh
@@ -36,8 +36,8 @@ protected:
   void parse_command_line(void) const ;
   void parse_file(void) const ;
 
-  /// If help was requested by user, displays accepted options and exit
-  void print_usage_and_exit_if_requested(void) const ;
+  /// Print usage and/or version information if requested by the user
+  void print_information_and_exit_if_requested(void) const ;
   //@}
 
 public: