--- a/linuxdoc-tools.build	2021-02-13 22:47:23.288731358 +0200
+++ b/linuxdoc-tools.build	2021-02-13 22:48:36.128510941 +0200
@@ -53,6 +53,10 @@
            export LIBDIRSUFFIX="64"
            export HOSTTARGET=""
            ;;
+  riscv64) export SLKCFLAGS="-O2"
+           export LIBDIRSUFFIX="64"
+           export HOSTTARGET=""
+           ;;
   i?86)    export SLKCFLAGS="-O2 -march=i586 -mtune=i686"
            export LIBDIRSUFFIX=""
            export HOSTTARGET=""
@@ -108,7 +112,8 @@
   --prefix=/usr \
   --sysconfdir=/etc \
   --docdir=/usr/doc/asciidoc-$ASCIIDOCVER \
-  --mandir=/usr/man || exit 1
+  --mandir=/usr/man \
+  --build=$ARCH-unknown-linux$HOSTTARGET || exit 1
 
 # Install:
 if [ "$1" = "nodocs" ]; then
@@ -349,6 +354,7 @@
   --enable-http \
   --enable-default-catalog=/etc/sgml/catalog \
   --enable-default-search-path=/usr/share/sgml \
+  --build=$ARCH-unknown-linux$HOSTTARGET \
   || exit 1
 
 # Build:
@@ -429,6 +435,7 @@
   --enable-default-catalog=/etc/sgml/catalog \
   --enable-default-search-path=/usr/share/sgml \
   --datadir=/usr/share/sgml/openjade-$OPENJADEVER \
+  --build=$ARCH-unknown-linux$HOSTTARGET \
   || exit 1
 
 # Build:
@@ -1059,7 +1066,7 @@
   --mandir=/usr/man \
   --disable-scrollkeeper \
   --enable-build-utils \
-  --build=$ARCH-slackware-linux$HOSTTARGET || exit 1
+  --build=$ARCH-unknown-linux$HOSTTARGET || exit 1
 
 # No parallel build here because it doesn't work:
 make || exit 1
@@ -1201,7 +1208,7 @@
    --disable-dependency-tracking \
    --program-transform-name="s/^docbook2/docbook2x-/" \
    --with-html-xsl \
-   --build=$ARCH-slackware-linux$HOSTTARGET || exit 1
+   --build=$ARCH-unknown-linux$HOSTTARGET || exit 1
 
 # Build:
 make || exit 1