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+Title: Problems with png-config and fltk-config
+Author: rodarima
+Created: Wed, 11 Sep 2024 07:56:42 +0000
+State: open
+
+When installing FLTK in a different directory than /usr while keeping another installation there, I cannot link Dillo as it tries to find the libraries from /usr/lib due to a flag inserted by png-config:
+
+```
+g++ \
+  -I/usr/include/libpng16 \
+  -I/home/ram/dev/dillo/fltk/git/install/include \
+  -D_LARGEFILE_SOURCE \
+  -D_LARGEFILE64_SOURCE \
+  -D_FILE_OFFSET_BITS=64 \
+  -D_THREAD_SAFE \
+  -D_REENTRANT \
+  -g \
+  -O2 \
+  -Wall \
+  -W \
+  -Wno-unused-parameter \
+  -fno-rtti \
+  -fno-exceptions \
+  -pedantic \
+  -std=c++11 \
+  -D_POSIX_C_SOURCE=200112L \
+   \
+   \
+  -o \
+  dillo \
+  dillo.o \
+  paths.o \
+  tipwin.o \
+  ui.o \
+  uicmd.o \
+  bw.o \
+  cookies.o \
+  hsts.o \
+  auth.o \
+  md5.o \
+  digest.o \
+  colors.o \
+  misc.o \
+  history.o \
+  prefs.o \
+  prefsparser.o \
+  keys.o \
+  url.o \
+  bitvec.o \
+  klist.o \
+  chain.o \
+  utf8.o \
+  timeout.o \
+  dialog.o \
+  web.o \
+  nav.o \
+  cache.o \
+  decode.o \
+  dicache.o \
+  capi.o \
+  domain.o \
+  css.o \
+  cssparser.o \
+  styleengine.o \
+  plain.o \
+  html.o \
+  form.o \
+  table.o \
+  bookmark.o \
+  dns.o \
+  gif.o \
+  jpeg.o \
+  png.o \
+  svg.o \
+  imgbuf.o \
+  image.o \
+  menu.o \
+  dpiapi.o \
+  findbar.o \
+  xembed.o \
+  ../dlib/libDlib.a \
+  ../dpip/libDpip.a \
+  IO/libDiof.a \
+  ../dw/libDw-widgets.a \
+  ../dw/libDw-fltk.a \
+  ../dw/libDw-core.a \
+  ../lout/liblout.a \
+  -ljpeg \
+  -L/usr/lib \ <-------- here
+  -lpng16 \
+  -L/home/ram/dev/dillo/fltk/git/install/lib \
+  -lfltk \
+  -lm \
+  -lpthread \
+  -lXinerama \
+  -lXfixes \
+  -lXcursor \
+  -L/usr/lib \
+  -lpangoxft-1.0 \
+  -lpangoft2-1.0 \
+  -lpango-1.0 \
+  -lgobject-2.0 \
+  -lglib-2.0 \
+  -lharfbuzz \
+  -lfontconfig \
+  -lfreetype \
+  -lXft \
+  -lpangocairo-1.0 \
+  -lcairo \
+  -lX11 \
+  -lXrender \
+  -lwayland-cursor \
+  -lwayland-client \
+  -lxkbcommon \
+  -ldbus-1 \
+  -ldecor-0 \
+  -ldl \
+  -lz \
+  -liconv \
+  -lpthread \
+  -lX11 \
+  -lcrypto \
+  -lssl
+```
+
+Ideally we should either point to the whole path with -l or discover how to make -L only affect the corresponding -l library.
+
+--%--
+From: rodarima
+Date: Wed, 11 Sep 2024 08:36:38 +0000
+
+Tried `-Wl,--push-state` but it doesn't seem to affect `-L`.
+
+--%--
+From: rodarima
+Date: Wed, 11 Sep 2024 09:02:07 +0000
+
+We should let the users pass the FLTK and other flags manually, so we avoid the problem in which a injected `-L` from fltk-config or png-config affects the rest of the libraries.
+
+--%--
+From: rodarima
+Date: Mon, 14 Apr 2025 17:55:18 +0000
+
+Also, fltk-config is injecting its own -O2 flags, which will race with the optimization level for debugging.
+
+--%--
+From: rodarima
+Date: Sun, 31 Aug 2025 22:44:30 +0000
+
+There is another issue, if there is already an FLTK library installed in /usr/lib (or potentially /usr/local/lib) it can be loaded *instead* of the one dillo was linked against. We would need to add the corresponding `-Wl,-rpath,...` flags for the linker as well.
+
+I think leaving the control of the variable to the use for non-standard installation is the best choice, so it can also inject platform or compiler specific flags.
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