Building with gcc-11: abstractaddin.cpp:29:15: error: ‘NULL’ was not declared in this scope
libtool: compile: x86_64-pc-linux-gnu-g++ -std=gnu++14 -DHAVE_CONFIG_H -I. -I.. -I.. -pthread -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/atkmm-1.6 -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/sysprof-3 -I/usr/include/gio-unix-2.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/lib64/libffi/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -pthread -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/lib64/libffi/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/sysprof-3 -I/usr/include/gio-unix-2.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/lib64/libffi/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -pthread -I/usr/include/gspell-1 -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/sysprof-3 -I/usr/include/gio-unix-2.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/lib64/libffi/include -I/usr/include/enchant-2 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libxml2 -I/usr/include/libxml2 -I/usr/include/uuid -pthread -I/usr/include/libsecret-1 -I/usr/include/gio-unix-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/lib64/libffi/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -DGNOTE_LOCALEDIR=\"/usr/share/locale\" -DDATADIR=\"/usr/share\" -DLIBDIR=\"/usr/lib64\" -DNDEBUG -Wall -Wcast-align -Wcast-qual -Wformat-security -Wpointer-arith -Wreturn-type -O2 -march=znver3 -pipe -DNDEBUG -Wall -Wextra -Wsign-compare -Wpointer-arith -Wchar-subscripts -Wwrite-strings -Wunused -Wpointer-arith -Wshadow -fshow-column -c addinmanager.cpp -fPIC -DPIC -o .libs/addinmanager.o
abstractaddin.cpp: In constructor ‘gnote::AbstractAddin::AbstractAddin()’:
abstractaddin.cpp:29:15: error: ‘NULL’ was not declared in this scope
29 | : m_gnote(NULL)
| ^~~~
abstractaddin.cpp:25:1: note: ‘NULL’ is defined in header ‘<cstddef>’; did you forget to ‘#include <cstddef>’?
24 | #include "abstractaddin.hpp"
+++ |+#include <cstddef>
25 |
make[3]: *** [Makefile:1440: abstractaddin.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
Edited by kobboi