fix library name

src/CMakeLists.txt

@@ -295,7 +295,10 @@ target_link_libraries(mapnik PRIVATE
     mapnik::agg
 )
 
-set_target_properties(mapnik PROPERTIES DEBUG_POSTFIX ${MAPNIK_DEBUG_POSTFIX})
+set_target_properties(mapnik PROPERTIES 
+    DEBUG_POSTFIX ${MAPNIK_DEBUG_POSTFIX}
+    PREFIX "lib"
+)
 
 install(TARGETS mapnik 
     EXPORT MapnikTargets

src/json/CMakeLists.txt

@@ -27,6 +27,7 @@ target_link_libraries(json PRIVATE mapnik::core ${ICUU_LIB})
 set_target_properties(json PROPERTIES 
     DEBUG_POSTFIX ${MAPNIK_DEBUG_POSTFIX}
     POSITION_INDEPENDENT_CODE ON
+    PREFIX "libmapnik-"
 )
 
 install(TARGETS json 

src/wkt/CMakeLists.txt

@@ -19,6 +19,7 @@ target_link_libraries(wkt PRIVATE mapnik::core)
 set_target_properties(wkt PROPERTIES 
     DEBUG_POSTFIX ${MAPNIK_DEBUG_POSTFIX}
     POSITION_INDEPENDENT_CODE ON
+    PREFIX "libmapnik-"
 )
 
 install(TARGETS wkt