Build Problems on Linux

[Robert Lichtenberger]

I haven't built in a while but today I pulled the current master branch and
tried to build OpenJFX.
Unfortunately, the task :graphics:ccLinuxGlassGlassgtk2 fails like this:

:graphics:ccLinuxGlassGlassgtk2 (Thread[Daemon worker Thread 2,5,main])
started.
Starting process 'command 'gcc''. Working directory:
/home/rli/PWEs/jfx/modules/javafx.graphics Command: gcc
-fno-strict-aliasing -fPIC -fno-omit-frame-pointer -fstack-protector
-Wextra -Wall -Wformat-security -Wno-unused -Wno-parentheses
-Werror=implicit-function-declaration -Werror=trampolines
-I/usr/java/jdk-12.0.2+10/include -I/usr/java/jdk-12.0.2+10/include/linux
-c -ffunction-sections -fdata-sections -O2 -DNDEBUG -I/usr/include/gtk-2.0
-I/usr/lib64/gtk-2.0/include -I/usr/include/pango-1.0
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include
-I/usr/include/harfbuzz -I/usr/include/fribidi -I/usr/include/freetype2
-I/usr/include/libpng16 -I/usr/include/cairo -I/usr/include/pixman-1
-I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid
-I/usr/include/atk-1.0 -pthread
 -I/home/rli/PWEs/jfx/modules/javafx.graphics/build/gensrc/headers/javafx.graphics
-o
/home/rli/PWEs/jfx/modules/javafx.graphics/build/native/glass/linux/glassgtk2/wrapped.obj
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/wrapped.c
Successfully started process 'command 'gcc''
gcc: error: : No such file or directory
... repeats 17 times for different files ...

> Task :graphics:ccLinuxGlassGlassgtk2 FAILED
Caching disabled for task ':graphics:ccLinuxGlassGlassgtk2' because:
  Build cache is disabled
Task ':graphics:ccLinuxGlassGlassgtk2' is not up-to-date because:
  Task has failed previously.
Compiling native files:
[/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/wrapped.c,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_key.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassView.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassCommonDialogs.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassRobot.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassPixels.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassDnDClipboard.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassCursor.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_general.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassApplication.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassWindow.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_dnd.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassSystemClipboard.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_evloop.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_window_ime.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/GlassTimer.cpp,
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/glass_screen.cpp]
:graphics:ccLinuxGlassGlassgtk2 (Thread[Daemon worker Thread 2,5,main])
completed. Took 0.06 secs.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':graphics:ccLinuxGlassGlassgtk2'.
> java.util.concurrent.ExecutionException:
org.gradle.process.internal.ExecException: Process 'command 'gcc'' finished
with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug
option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible
with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See
https://docs.gradle.org/6.0/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 1s

When I execute the command manually:
gcc -fno-strict-aliasing -fPIC -fno-omit-frame-pointer -fstack-protector
-Wextra -Wall -Wformat-security -Wno-unused -Wno-parentheses
-Werror=implicit-function-declaration -Werror=trampolines
-I/usr/java/jdk-12.0.2+10/include -I/usr/java/jdk-12.0.2+10/include/linux
-c -ffunction-sections -fdata-sections -O2 -DNDEBUG -I/usr/include/gtk-2.0
-I/usr/lib64/gtk-2.0/include -I/usr/include/pango-1.0
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include
-I/usr/include/harfbuzz -I/usr/include/fribidi -I/usr/include/freetype2
-I/usr/include/libpng16 -I/usr/include/cairo -I/usr/include/pixman-1
-I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid
-I/usr/include/atk-1.0 -pthread
 -I/home/rli/PWEs/jfx/modules/javafx.graphics/build/gensrc/headers/javafx.graphics
-o
/home/rli/PWEs/jfx/modules/javafx.graphics/build/native/glass/linux/glassgtk2/wrapped.obj
/home/rli/PWEs/jfx/modules/javafx.graphics/src/main/native-glass/gtk/wrapped.c

I can successfully compile the file.

Any hints / suggestions welcome as to what is going wrong here.
Robert