use same fltk commit hash for all releases

de9c80f8 · Christophe Geuzaine · ab75e4d3 · de9c80f8
Commit de9c80f8 authored 3 years ago by Christophe Geuzaine
--- a/utils/docker/Dockerfile.debian.stretch.64bit
+++ b/utils/docker/Dockerfile.debian.stretch.64bit
@@ -113,7 +113,7 @@ RUN curl -L -o occt.tgz "http://git.dev.opencascade.org/gitweb/?p=occt.git;a=sna
 # FLTK
 # -----------------------

-RUN git clone https://github.com/fltk/fltk.git && cd fltk && make makeinclude && ./configure --enable-localpng=no --enable-localzlib=no --enable-localjpeg=no && make -j 4 && make install && cd ../.. && rm -rf fltk
+RUN git clone https://github.com/fltk/fltk.git && cd fltk && git checkout 1ce3a84 && make makeinclude && ./configure --enable-localpng=no --enable-localzlib=no --enable-localjpeg=no && make -j 4 && make install && cd ../.. && rm -rf fltk

 # -----------------------
 # MMG