Fix some CMake warnings

CMakeLists.txt

@@ -191,7 +191,12 @@ file(
 # Cbc
 
 if(HAS_CBC)
-    find_package(CBC)
+    find_package(PkgConfig)
+
+    if(PkgConfig_FOUND)
+        include(FindPkgConfig)
+        find_package(CBC)
+    endif()
 
     if(CBC_FOUND)
         link_directories(${CBC_LIBRARY_DIRS})
@@ -231,7 +236,7 @@ endif(HAS_CPLEX)
 # Gurobi
 
 if(HAS_GUROBI)
-    find_package(Gurobi)
+    find_package(GUROBI)
     add_definitions(-DHAS_GUROBI)
 
     if(GUROBI_FOUND)
@@ -254,7 +259,7 @@ if(HAS_HIGHS)
 
     if(USE_EXTERNAL_HIGHS)
         find_package(Threads REQUIRED)
-        find_package(HIGHS REQUIRED EXACT PATHS ${HIGHS_EXTERNAL_DIR} NO_DEFAULT_PATH)
+        find_package(HIGHS REQUIRED PATHS ${HIGHS_EXTERNAL_DIR} NO_DEFAULT_PATH)
     endif()
 
     if(NOT(USE_EXTERNAL_HIGHS))

misc/FindCBC.cmake

@@ -1,28 +1,21 @@
-find_package(PkgConfig)
-
 set(CBC_FOUND false)
 
-if(PkgConfig_FOUND)
-  include(FindPkgConfig)
-
-  set(ENV{PKG_CONFIG_PATH} "${CBC_DIR}/lib/pkgconfig")
-  pkg_search_module(CBC cbc)
+set(ENV{PKG_CONFIG_PATH} "${CBC_DIR}/lib/pkgconfig")
+pkg_search_module(CBC cbc)
 
-  if(CBC_FOUND)
-    message("-- Cbc found using Pkg-config:")
-    message("   Include directories found: ${CBC_INCLUDE_DIRS}")
-    message("   Library directories found: ${CBC_LIBRARY_DIRS}")
+if(CBC_FOUND)
+  message("-- Cbc found using Pkg-config:")
+  message("   Include directories found: ${CBC_INCLUDE_DIRS}")
+  message("   Library directories found: ${CBC_LIBRARY_DIRS}")
 
-    # Handle the QUIETLY and REQUIRED arguments and set CBC_FOUND to TRUE if all listed variables are TRUE.
-    find_package_handle_standard_args(CBC
-                                      DEFAULT_MSG
-                                      CBC_LIBRARIES
-                                      CBC_INCLUDE_DIRS
-                                      CBC_LIBRARY_DIRS)
-    mark_as_advanced(CBC_LIBRARIES CBC_INCLUDE_DIRS CBC_LIBRARY_DIRS)
-  endif(CBC_FOUND)
-
-endif(PkgConfig_FOUND)
+  # Handle the QUIETLY and REQUIRED arguments and set CBC_FOUND to TRUE if all listed variables are TRUE.
+  find_package_handle_standard_args(CBC
+                                    DEFAULT_MSG
+                                    CBC_LIBRARIES
+                                    CBC_INCLUDE_DIRS
+                                    CBC_LIBRARY_DIRS)
+  mark_as_advanced(CBC_LIBRARIES CBC_INCLUDE_DIRS CBC_LIBRARY_DIRS)
+endif(CBC_FOUND)
 
 if(NOT (CBC_FOUND))