Ensure it uses our FindIconv.cmake module
Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -431,9 +431,9 @@ find_package(Freetype)
 if(NOT FREETYPE_FOUND)
   report_mandatory_not_found(FREETYPE)
 endif(NOT FREETYPE_FOUND)
-include_directories(${FREETYPE_INCLUDE_DIR})
+include_directories(${FREETYPE_INCLUDE_DIRS})
 ms_link_libraries( ${FREETYPE_LIBRARY})
-list(APPEND ALL_INCLUDE_DIRS ${FREETYPE_INCLUDE_DIR})
+list(APPEND ALL_INCLUDE_DIRS ${FREETYPE_INCLUDE_DIRS})
 
 
 find_package(Proj)
@@ -503,7 +503,7 @@ endif( USE_FRIBIDI AND NOT(USE_HARFBUZZ) )
 
 
 if(WITH_ICONV)
-  find_package(ICONV)
+  find_package(Iconv)
   if(ICONV_FOUND)
     include_directories(${ICONV_INCLUDE_DIR})
     ms_link_libraries( ${ICONV_LIBRARY})
@@ -1074,7 +1074,7 @@ if(UNIX)
 else()
   set(DEFAULT_DATA_SUBDIR share/mapserver)
 endif()
-set(DEFAULT_CONFIG_FILE ${CMAKE_INSTALL_FULL_SYSCONFDIR}/mapserver.conf)
+set(DEFAULT_CONFIG_FILE /${CMAKE_INSTALL_SYSCONFDIR}/mapserver.conf)
 
 # Locations are changeable by user to customize layout of MapServer installation
 # (default values are platform-specific)
@@ -1107,5 +1107,5 @@ install(
 
 install(
   FILES ${PROJECT_SOURCE_DIR}/etc/mapserver-sample.conf
-  DESTINATION ${CMAKE_INSTALL_FULL_SYSCONFDIR}/
+  DESTINATION ${MAPSERVER_DATA_SUBDIR}/
 )