diff --git a/3rdparty/ext_gmic/CMakeLists.txt b/3rdparty/ext_gmic/CMakeLists.txt
index 3a50d4205b..0a6a19a852 100644
--- a/3rdparty/ext_gmic/CMakeLists.txt
+++ b/3rdparty/ext_gmic/CMakeLists.txt
@@ -1,42 +1,40 @@
 SET(PREFIX_ext_gmic "${EXTPREFIX}" )
 
 # Download the gmic sources
 ExternalProject_Add( ext_gmic_base
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-    URL https://gmic.eu/files/source/gmic_2.7.1.tar.gz
-    URL_MD5 11a947bb2fc1dfdd40995982c5c448eb
+    URL https://gmic.eu/files/source/gmic_2.9.0.tar.gz
+    URL_MD5 0980af23bfc6466f6aab3d60d758f1ac
 
-    PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/cmake.diff
-          COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/no_threads.diff
+    PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/no_threads.diff
 
     SOURCE_DIR gmic
 
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_gmic} -D -DCMAKE_BUILD_TYPE=Release ${GLOBAL_PROFILE}
 
     BUILD_COMMAND ""
     INSTALL_COMMAND ""
 
     BUILD_IN_SOURCE 1
 )
 
 # Download and build gmic-qt
 # FIXME: Forcing CMAKE_BUILD_TYPE to Release
 ExternalProject_Add( ext_gmic_qt
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-    URL https://github.com/c-koi/gmic-qt/archive/v.2.7.0.tar.gz
-    URL_MD5 b18577dfd5be0311bdad7737b56386dc
+    URL https://github.com/c-koi/gmic-qt/archive/v.2.9.0.tar.gz
+    URL_MD5 40bb7311a4e68bd52d5fcaa19ba37c66
     PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/desktop_icon.diff
-          COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/gmic-qt-cmake.diff
 
     SOURCE_DIR gmic-qt
     INSTALL_DIR ${PREFIX_ext_gmic}
 
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_gmic} -DGMIC_QT_HOST=krita -DCMAKE_BUILD_TYPE=Release ${GLOBAL_PROFILE}
 
     UPDATE_COMMAND ""
 
     DEPENDS ext_gmic_base
 )
 
 add_custom_target(ext_gmic)
 add_dependencies(ext_gmic ext_gmic_qt)
diff --git a/3rdparty/ext_gmic/desktop_icon.diff b/3rdparty/ext_gmic/desktop_icon.diff
index 7d58b215b6..fdb15a4593 100644
--- a/3rdparty/ext_gmic/desktop_icon.diff
+++ b/3rdparty/ext_gmic/desktop_icon.diff
@@ -1,76 +1,14 @@
-From f05b7865bb29479281f9d6613841d4613f2d62ff Mon Sep 17 00:00:00 2001
-From: Boudewijn Rempt <boud@valdyas.org>
-Date: Fri, 16 Feb 2018 13:22:29 +0100
-Subject: [PATCH] ...
-
----
- CMakeLists.txt        | 11 ++++-------
- gmic_krita_qt.desktop |  9 +++++++++
- 2 files changed, 13 insertions(+), 7 deletions(-)
- create mode 100644 gmic_krita_qt.desktop
-
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index c63b434..59a906c 100644
+index 7d2f971..c6797af 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -75,10 +75,6 @@ if (NOT(${GMIC_VERSION} EQUAL ${CIMG_VERSION}))
-   message(FATAL_ERROR "\nVersion numbers of files 'gmic.h' (" ${GMIC_VERSION} ") and 'CImg.h' ("${CIMG_VERSION} ") mismatch")
- endif()
- 
--
--
--
--
- option(PRERELEASE "Set to ON makes this a prelease build")
- if (${PRERELEASE})
-     string(TIMESTAMP PRERELEASE_DATE %y%m%d)
-@@ -91,8 +87,6 @@ if (${DRMINGW})
-     add_definitions(-DDRMINGW)
- endif()
- 
--
--
- # Required packages
- 
- #
-@@ -427,7 +421,6 @@ qt5_add_translation(gmic_qt_QM
-     translations/zh.ts
-   )
- 
--install(FILES ${gmic_qt_QM} DESTINATION ${CMAKE_SOURCE_DIR}/translations)
- 
- set(gmic_qt_QRC
-     gmic_qt.qrc
-@@ -461,6 +454,9 @@ elseif (${GMIC_QT_HOST} STREQUAL "krita")
-         ${gmic_qt_LIBRARIES}
- 	)
- 
-+    install(TARGETS gmic_krita_qt RUNTIME DESTINATION  ${CMAKE_INSTALL_PREFIX}/bin)
+@@ -533,7 +533,8 @@ elseif (${GMIC_QT_HOST} STREQUAL "krita")
+       PRIVATE
+       ${gmic_qt_LIBRARIES}
+       )
+-    install(TARGETS gmic_krita_qt RUNTIME DESTINATION bin)
++    install(TARGETS gmic_krita_qt RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
 +    install(FILES gmic_krita_qt.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/bin OPTIONAL)
-+
- elseif (${GMIC_QT_HOST} STREQUAL "none")
  
-     set (gmic_qt_SRCS ${gmic_qt_SRCS} src/Host/None/host_none.cpp src/Host/None/ImageDialog.h src/Host/None/ImageDialog.cpp)
-@@ -473,3 +469,4 @@ else()
- endif()
+ elseif (${GMIC_QT_HOST} STREQUAL "none")
  
- feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)
-+
-diff --git a/gmic_krita_qt.desktop b/gmic_krita_qt.desktop
-new file mode 100644
-index 0000000..579d427
---- /dev/null
-+++ b/gmic_krita_qt.desktop
-@@ -0,0 +1,9 @@
-+[Desktop Entry]
-+Name=gmic_krita_qt
-+Exec=gmic_krita_qt
-+GenericName=G'Mic plugin for Krita
-+Comment=G'Mic plugin for Krita
-+Type=Application
-+Icon=gmic_krita_qt
-+Categories=Qt;KDE;Graphics;
-+StartupNotify=false
--- 
-2.12.3
-
diff --git a/3rdparty/ext_gmic/gmic-qt-cmake.diff b/3rdparty/ext_gmic/gmic-qt-cmake.diff
deleted file mode 100644
index b703c7cae8..0000000000
--- a/3rdparty/ext_gmic/gmic-qt-cmake.diff
+++ /dev/null
@@ -1,22 +0,0 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 9da4953..4fd8c7b 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -272,7 +272,7 @@ set (gmic_qt_SRCS
-   src/FilterParameters/ChoiceParameter.h
-   src/FilterParameters/ColorParameter.h
-   src/FilterParameters/ConstParameter.h
--  src/FilterParameters/CustomDoubleSpinbox.h
-+  src/FilterParameters/CustomDoubleSpinBox.h
-   src/FilterParameters/FileParameter.h
-   src/FilterParameters/FilterParametersWidget.h
-   src/FilterParameters/FloatParameter.h
-@@ -344,7 +344,7 @@ set (gmic_qt_SRCS
-   src/FilterParameters/ChoiceParameter.cpp
-   src/FilterParameters/ColorParameter.cpp
-   src/FilterParameters/ConstParameter.cpp
--  src/FilterParameters/CustomDoubleSpinbox.cpp
-+  src/FilterParameters/CustomDoubleSpinBox.cpp
-   src/FilterParameters/FileParameter.cpp
-   src/FilterParameters/FilterParametersWidget.cpp
-   src/FilterParameters/FloatParameter.cpp
diff --git a/3rdparty/ext_gmic/no_threads.diff b/3rdparty/ext_gmic/no_threads.diff
index 916ddc4391..d1413d282a 100644
--- a/3rdparty/ext_gmic/no_threads.diff
+++ b/3rdparty/ext_gmic/no_threads.diff
@@ -1,13 +1,13 @@
 diff --git a/src/CImg.h b/src/CImg.h
-index 6fe7455..a1450f4 100644
+index 2b7a53b..886daf7 100644
 --- a/src/CImg.h
 +++ b/src/CImg.h
-@@ -3194,7 +3194,7 @@ namespace cimg_library_suffixed {
- #if defined(cimg_use_fftw3)
-     struct FFTW3_info {
-       FFTW3_info() {
+@@ -3205,7 +3205,7 @@ namespace cimg_library_suffixed {
+ #if defined(cimg_use_fftw3) && !defined(cimg_use_fftw3_singlethread)
+     struct FFTW3_static {
+       FFTW3_static() {
 -        fftw_init_threads();
 +        //fftw_init_threads();
        }
-     }; // struct FFTW3_info { ...
-     static FFTW3_info _FFTW3_info;
+     }; // struct FFTW3_static { ...
+     static FFTW3_static _FFTW3_static;