Try using doxygen binary

.travis.yml

@@ -33,17 +33,24 @@ script:
 
 after_success:
 # Build latest doxygen from source
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd /tmp; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then git clone https://github.com/doxygen/doxygen.git; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd doxygen; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then ./configure; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make distclean; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then git pull; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then ./configure; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then sudo make install; fi
+#  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd "${TRAVIS_BUILD_DIR}"; fi
+
+# Install doxygen binary distribution 
   - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd /tmp; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then git clone https://github.com/doxygen/doxygen.git; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd doxygen; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then ./configure; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make distclean; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then git pull; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then ./configure; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then make; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then sudo make install; fi
-  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd "${TRAVIS_BUILD_DIR}"; fi
+  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then curl http://ftp.stack.nl/pub/users/dimitri/doxygen-1.8.7.linux.bin.tar.gz; fi
+  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then tar -xvf doxygen-1.8.7.linux.bin.tar.gz; fi
+  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then cd doxygen-1.8.7; fi
+  - if [ "$config" = "release64" -a "$CC" = "clang" ]; then sudo install -m 755 doxygen-1.8.7/bin/doxygen /usr/bin; fi
 
 # Run doxygen  
   - if [ "$config" = "release64" -a "$CC" = "clang" ]; then doxygen build/Doxyfile; fi