The header files of the plugins also have to be installed.

CMakeLists.txt

@@ -151,6 +151,7 @@ ENDIF(GSOAPPP AND NOT EXISTS ${GSOAPPP})
 ###########################################################
 #for the install target
 FILE(GLOB hfiles "meteoio/*.h")
+FILE(GLOB hpluginfiles "meteoio/plugins/*.h")
 FILE(GLOB hlawsfiles "meteoio/meteolaws/*.h")
 FILE(GLOB hfilterfiles "meteoio/meteofilters/*.h")
 FILE(GLOB hstatsfiles "meteoio/meteostats/*.h")
@@ -161,6 +162,7 @@ IF(DEST MATCHES "par")
 	INSTALL(FILES ${modules} DESTINATION lib/meteoio COMPONENT libraries)
 ENDIF(DEST MATCHES "par")
 INSTALL(FILES ${hfiles} ${phfiles} DESTINATION include/meteoio COMPONENT headers)
+INSTALL(FILES ${hpluginfiles} DESTINATION include/meteoio/plugins COMPONENT headers)
 INSTALL(FILES ${hlawsfiles} DESTINATION include/meteoio/meteolaws COMPONENT headers)
 INSTALL(FILES ${hfilterfiles} DESTINATION include/meteoio/meteofilters COMPONENT headers)
 INSTALL(FILES ${hstatsfiles} DESTINATION include/meteoio/meteostats COMPONENT headers)