Index: gmic-3.0.1/src/gmic.h
===================================================================
--- gmic-3.0.1.orig/src/gmic.h
+++ gmic-3.0.1/src/gmic.h
@@ -258,12 +258,12 @@ inline double gmic_mp_store(const Ts *co
 
 #endif // #if cimg_OS==2
 
+#endif // #ifndef gmic_build
+
 // Define some special character codes used for replacement in double quoted strings.
 const char gmic_dollar = 23, gmic_lbrace = 24, gmic_rbrace = 25, gmic_comma = 26, gmic_dquote = 28,
   gmic_store = 29; // <- this one is only used in variable names.
 
-#endif // #ifndef gmic_build
-
 // Define main libgmic class 'gmic'.
 //----------------------------------
 #define gmic_image cimg_library::CImg

Index: gmic-3.0.1/CMakeLists.txt
===================================================================
--- gmic-3.0.1.orig/CMakeLists.txt
+++ gmic-3.0.1/CMakeLists.txt
@@ -165,7 +165,7 @@ if(BUILD_LIB)
     RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
     ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
   )
-  install(FILES src/gmic.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
+  install(FILES src/gmic.h src/CImg.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
 endif()