$ make -j$(nproc)
surf build options:
cp config.def.h config.h
CC            = c99
c99 -fPIC `pkg-config --cflags x11` `pkg-config --cflags gtk+-3.0 gcr-3 webkit2gtk-4.0` -DVERSION=\"2.1\" -DGCR_API_SUBJECT_TO_CHANGE  -DLIBPREFIX=\"/usr/local/lib\" -DWEBEXTDIR=\"/usr/local/lib/surf\"  -D_DEFAULT_SOURCE -O1 -c surf.c
Package x11 was not found in the pkg-config search path.
Perhaps you should add the directory containing `x11.pc'
to the PKG_CONFIG_PATH environment variable
No package 'x11' found
Package gtk+-3.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-3.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-3.0' found
Package gcr-3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gcr-3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gcr-3' found
Package webkit2gtk-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-4.0' found
Package x11 was not found in the pkg-config search path.
Perhaps you should add the directory containing `x11.pc'
to the PKG_CONFIG_PATH environment variable
No package 'x11' found
CFLAGS        = -fPIC   -DVERSION="2.1" -DGCR_API_SUBJECT_TO_CHANGE  -DLIBPREFIX="/usr/local/lib" -DWEBEXTDIR="/usr/local/lib/surf"  -D_DEFAULT_SOURCE -O1
Package gtk+-3.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-3.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-3.0' found
Package webkit2gtk-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-4.0' found
Package webkit2gtk-web-extension-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-web-extension-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-web-extension-4.0' found
Package gio-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gio-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gio-2.0' found
Package gcr-3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gcr-3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gcr-3' found
Package webkit2gtk-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-4.0' found
WEBEXTCFLAGS  = -fPIC  -O1
LDFLAGS       = 
c99 -fPIC `pkg-config --cflags webkit2gtk-4.0 webkit2gtk-web-extension-4.0 gio-2.0` -O1 -c webext-surf.c
Package webkit2gtk-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-4.0' found
Package webkit2gtk-web-extension-4.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `webkit2gtk-web-extension-4.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'webkit2gtk-web-extension-4.0' found
Package gio-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gio-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gio-2.0' found
surf.c:9:10: fatal error: glib.h: No such file or directory
    9 | #include <glib.h>
      |          ^~~~~~~~
compilation terminated.
make: *** [Makefile:31: surf.o] Error 1
make: *** Waiting for unfinished jobs....
webext-surf.c:9:10: fatal error: gio/gio.h: No such file or directory
    9 | #include <gio/gio.h>
      |          ^~~~~~~~~~~
compilation terminated.
make: *** [Makefile:37: webext-surf.o] Error 1

# apt search webkit2gtk
Sorting... Done
Full Text Search... Done
libwebkit2gtk-4.0-37/stable,now 2.34.1-1~deb11u1 i386 [installed]
  Web content engine library for GTK

libwebkit2gtk-4.0-dev/stable 2.34.1-1~deb11u1 i386
  Web content engine library for GTK - development files

libwebkit2gtk-4.0-doc/stable 2.34.1-1~deb11u1 all
  Web content engine library for GTK - documentation

webkit2gtk-driver/stable 2.34.1-1~deb11u1 i386
  WebKitGTK WebDriver support

# apt search webkit2gtk-web-extension gio
Sorting... Done
Full Text Search... Done

# apt search x11 | grep installed
x11-apps/stable,now 7.7+8 i386 [installed,automatic]
x11-common/stable,now 1:7.7+22 all [installed,automatic]
x11-session-utils/stable,now 7.7+4 i386 [installed,automatic]
x11-utils/stable,now 7.7+5 i386 [installed,automatic]
x11-xkb-utils/stable,now 7.7+5 i386 [installed,automatic]
x11-xserver-utils/stable,now 7.7+8 i386 [installed,automatic]
xclip/stable,now 0.13-2 i386 [installed,automatic]
xdotool/stable,now 1:3.20160805.1-4 i386 [installed]
xfce4-session/stable,now 4.16.0-1+devuan1 i386 [installed,automatic]
xfce4-terminal/stable,now 0.8.10-1 i386 [installed,automatic]
xkb-data/stable,now 2.29-2 all [installed,automatic]
xkbset/stable,now 0.6-1 i386 [installed,automatic]
xserver-xorg-video-ati/stable,now 1:19.1.0-2 i386 [installed,automatic]

# apt search grc-3
Sorting... Done
Full Text Search... Done

# apt search gtk+-3.0 | grep installed

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

gir1.2-gtk-3.0/stable,now 3.24.24-4 i386 [installed,automatic]
libgtk-3-0/stable,now 3.24.24-4 i386 [installed,automatic]