diff --git a/Apps/k3b/README b/Apps/k3b/README
new file mode 100644
index 0000000..651c3a3
--- /dev/null
+++ b/Apps/k3b/README
@@ -0,0 +1,16 @@
+The checks for musepack and musicbrainz installed are done based on:
+
+Musepack
+""""""""
+The musepack decoder was built with gcc11.2 and libmpcdec source
+https://files.musepack.net/source/libmpcdec-1.2.6.tar.bz2
+with default prefix /usr/local
+and ./configure --libdir=/usr/local/lib64 --disable-static
+
+Musicbrainz
+"""""""""""
+Libmusicbrainz 2.1.5 was built with the SBo libmusicbrainz script with gcc7.3 and Archlinux patch to fix gcc6 errors - https://bugs.archlinux.org/task/50754?getfile=14619
+
+
+Later versions cause FTBFS errors, either with gcc or k3b.
+ 
diff --git a/Apps/k3b/k3b.SlackBuild b/Apps/k3b/k3b.SlackBuild
index 7212224..7cb0377 100755
--- a/Apps/k3b/k3b.SlackBuild
+++ b/Apps/k3b/k3b.SlackBuild
@@ -59,13 +59,13 @@ chown_fn
 cd_builddir_fn
 
 # Check for ffmpeg:
-[[ -s /usr/include/libavcodec/avcodec.h ]] && FFMPEG="ON"
-# Check for lame:
-[[ -s /usr/include/lame/lame.h ]] && LAME="ON"
-# Check for musepack:
-[[ -s /usr/include/musepack/musepack.h ]] && MUSEPACK="ON"
+pkg-config libavcodec && FFMPEG="ON"
+# Check for lame [no .pc file]:
+ldconfig -p|grep libmp3lame 1>/dev/null && LAME="ON"
+# Check for musepack [no .pc file]:
+ldconfig -p|grep libmpcdec 1>/dev/null && MUSEPACK="ON"
 # Check for musicbrainz:
-[[ -s /usr/include/musicbrainz/mb_c.h ]] && MUSICBRAINZ="ON"
+pkg-config libmusicbrainz && MUSICBRAINZ="ON"
 
 cmake ${G_NINJA:-} \
     -DCMAKE_C_FLAGS="$SLKRCFLAGS" \
diff --git a/Misc/inkscape/README b/Misc/inkscape/README
index 4ded2fd..7a37eff 100644
--- a/Misc/inkscape/README
+++ b/Misc/inkscape/README
@@ -1,6 +1,6 @@
-inkscape v1.0.2 requires non-Slackware packages gdl and double-conversion.
+Inkscape v1* requires the non-Slackware package double-conversion.
 
-The sources will need to be pre-downloaded and placed in the 'src' directory and will then be built, packaged, and installed during the inkscape build.
+The source will need to be pre-downloaded and placed in the 'src' directory and will then be built, packaged, and installed during the inkscape build.
 
-The URLs will be displayed when running the SlackBuild if the installations or sources aren't found.
+The URL will be displayed when running the SlackBuild if the installation or source isn't found.