diff --git a/abi_used_libs b/abi_used_libs
--- a/abi_used_libs
+++ b/abi_used_libs
@@ -23,7 +23,6 @@
 libm.so.6
 libpangomm-1.4.so.1
 libpng16.so.16
-libpthread.so.0
 librsvg-2.so.2
 libsigc-2.0.so.0
 libstdc++.so.6
diff --git a/files/0001-fix-canon-mraw-and-sraw-regression.patch b/files/0001-fix-canon-mraw-and-sraw-regression.patch
new file mode 100644
--- /dev/null
+++ b/files/0001-fix-canon-mraw-and-sraw-regression.patch
@@ -0,0 +1,22 @@
+From 4221fdf31e43658cef98ad660ad398b8ae81b8d7 Mon Sep 17 00:00:00 2001
+From: Ingo Weyrich <heckflosse67@gmx.de>
+Date: Fri, 7 Feb 2020 13:52:25 +0100
+Subject: [PATCH] fix regression in Canon sRAW/mRAW black level computation,
+ taken from ART, fixes #5638
+
+---
+ rtengine/dcraw.cc | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
+index 812f122b3..0284b3f1d 100644
+--- a/rtengine/dcraw.cc
++++ b/rtengine/dcraw.cc
+@@ -9868,6 +9868,7 @@ void CLASS identify()
+     filters = 0;
+     tiff_samples = colors = 3;
+     load_raw = &CLASS canon_sraw_load_raw;
++    FORC4 cblack[c] = 0; // ALB
+   } else if (!strcmp(model,"PowerShot 600")) {
+     height = 613;
+     width  = 854;
diff --git a/package.yml b/package.yml
--- a/package.yml
+++ b/package.yml
@@ -1,6 +1,6 @@
 name       : rawtherapee
 version    : '5.8'
-release    : 14
+release    : 15
 source     :
     - https://rawtherapee.com/shared/source/rawtherapee-5.8.tar.xz : 360528a0aae922eb5af8742f415475fb91b6d62a739da5f2804828f04ec40853
 homepage   : https://rawtherapee.com/
@@ -9,7 +9,9 @@
 summary    : A powerful cross-platform raw photo processing program
 description: |
     RawTherapee is an advanced cross-platform program for developing raw photos and for processing non-raw photos. It is non-destructive, makes use of OpenMP, supports all the cameras supported by dcraw and more, and carries out its calculations in a high precision 32-bit floating point engine.
-optimize   : speed
+optimize   :
+    - speed
+    - lto
 builddeps  :
     - pkgconfig(exiv2)
     - pkgconfig(fftw3)
@@ -33,8 +35,10 @@
     #endif
     EOF
 
-    %cmake -DBUILD_SHARED=ON -DCACHE_NAME_SUFFIX=""
+    %patch -p1 < $pkgfiles/0001-fix-canon-mraw-and-sraw-regression.patch
+
+    %cmake_ninja -DBUILD_SHARED=ON -DCACHE_NAME_SUFFIX=""
 build      : |
-    %make
+    %ninja_build
 install    : |
-    %make_install
+    %ninja_install
diff --git a/pspec_x86_64.xml b/pspec_x86_64.xml
--- a/pspec_x86_64.xml
+++ b/pspec_x86_64.xml
@@ -3,8 +3,8 @@
         <Name>rawtherapee</Name>
         <Homepage>https://rawtherapee.com/</Homepage>
         <Packager>
-            <Name>Joshua Strobl</Name>
-            <Email>joshua@streambits.io</Email>
+            <Name>Jacob Alzén</Name>
+            <Email>jacob.alzen@gmail.com</Email>
         </Packager>
         <License>GPL-3.0-or-later</License>
         <PartOf>multimedia.graphics</PartOf>
@@ -589,12 +589,12 @@
         </Files>
     </Package>
     <History>
-        <Update release="14">
-            <Date>2020-03-12</Date>
+        <Update release="15">
+            <Date>2020-08-30</Date>
             <Version>5.8</Version>
             <Comment>Packaging update</Comment>
-            <Name>Joshua Strobl</Name>
-            <Email>joshua@streambits.io</Email>
+            <Name>Jacob Alzén</Name>
+            <Email>jacob.alzen@gmail.com</Email>
         </Update>
     </History>
 </PISI>
\ No newline at end of file