diff -r 1782aa72495a -r fc3854d936f7 CMakeLists.txt
--- a/CMakeLists.txt	Fri Jul 20 17:09:01 2012 +0200
+++ b/CMakeLists.txt	Sat May 25 06:59:31 2013 +0200
@@ -61,9 +61,64 @@
 
 FIND_PACKAGE(Doxygen)
 FIND_PACKAGE(Ghostscript)
-FIND_PACKAGE(GLPK 4.33)
-FIND_PACKAGE(ILOG)
-FIND_PACKAGE(COIN)
+
+SET(LEMON_ENABLE_GLPK YES CACHE STRING "Enable GLPK solver backend.")
+SET(LEMON_ENABLE_ILOG YES CACHE STRING "Enable ILOG (CPLEX) solver backend.")
+SET(LEMON_ENABLE_COIN YES CACHE STRING "Enable COIN solver backend.")
+
+IF(LEMON_ENABLE_GLPK) 
+  FIND_PACKAGE(GLPK 4.33)
+ENDIF(LEMON_ENABLE_GLPK)
+IF(LEMON_ENABLE_ILOG)
+  FIND_PACKAGE(ILOG)
+ENDIF(LEMON_ENABLE_ILOG)
+IF(LEMON_ENABLE_COIN)
+  FIND_PACKAGE(COIN)
+ENDIF(LEMON_ENABLE_COIN)
+
+IF(GLPK_FOUND)
+  SET(LEMON_HAVE_LP TRUE)
+  SET(LEMON_HAVE_MIP TRUE)
+  SET(LEMON_HAVE_GLPK TRUE)
+ENDIF(GLPK_FOUND)
+IF(ILOG_FOUND)
+  SET(LEMON_HAVE_LP TRUE)
+  SET(LEMON_HAVE_MIP TRUE)
+  SET(LEMON_HAVE_ILOG TRUE)
+ENDIF(ILOG_FOUND)
+IF(COIN_FOUND)
+  SET(LEMON_HAVE_LP TRUE)
+  SET(LEMON_HAVE_MIP TRUE)
+  SET(LEMON_HAVE_CLP TRUE)
+  SET(LEMON_HAVE_CBC TRUE)
+ENDIF(COIN_FOUND)
+
+IF(ILOG_FOUND)
+  SET(DEFAULT_LP "CPLEX")
+  SET(DEFAULT_MIP "CPLEX")
+ELSEIF(COIN_FOUND)
+  SET(DEFAULT_LP "CLP")
+  SET(DEFAULT_MIP "CBC")
+ELSEIF(GLPK_FOUND)
+  SET(DEFAULT_LP "GLPK")
+  SET(DEFAULT_MIP "GLPK")
+ENDIF()
+
+IF(NOT LEMON_DEFAULT_LP OR
+    (NOT ILOG_FOUND AND (LEMON_DEFAULT_LP STREQUAL "CPLEX")) OR
+    (NOT COIN_FOUND AND (LEMON_DEFAULT_LP STREQUAL "CLP")) OR
+    (NOT GLPK_FOUND AND (LEMON_DEFAULT_LP STREQUAL "GLPK")))
+  SET(LEMON_DEFAULT_LP ${DEFAULT_LP} CACHE STRING
+    "Default LP solver backend (GLPK, CPLEX or CLP)" FORCE)
+ENDIF()
+IF(NOT LEMON_DEFAULT_MIP OR
+    (NOT ILOG_FOUND AND (LEMON_DEFAULT_MIP STREQUAL "CPLEX")) OR
+    (NOT COIN_FOUND AND (LEMON_DEFAULT_MIP STREQUAL "CBC")) OR
+    (NOT GLPK_FOUND AND (LEMON_DEFAULT_MIP STREQUAL "GLPK")))
+  SET(LEMON_DEFAULT_MIP ${DEFAULT_MIP} CACHE STRING
+    "Default MIP solver backend (GLPK, CPLEX or CBC)" FORCE)
+ENDIF()
+
 
 IF(DEFINED ENV{LEMON_CXX_WARNING})
   SET(CXX_WARNING $ENV{LEMON_CXX_WARNING})