The error I mentioned in previous email about endless loop
invoking "viewman" on macOS can be easily reproduced on Linux
as well:

Simple build with "--with-x=no", then a default "FRICAS=. ./bin/fricas"
will end up with endless:

/bin/sh: line 1: /tmp/fricas/target/x86_64-linux-gnu/lib/viewman: No such file or directory

This is caused by d1b3fa941ad7b01f9e33f8b952db3a54158a9b60 in 2020-04-17

--- a/src/etc/fricas
+++ b/src/etc/fricas
@@ -131,6 +131,11 @@ if [ ! -f $FRICAS/lib/viewman ] ; then
     otheropts="-nogr"
 fi

+if [ ! -f $FRICAS/bin/hypertex ]; then
+    echo "hypertex  not present, disabling"
+    otheropts="-noht"
+fi
+

 while [ "$*" != "" ] ; do

The fix would be:

diff --git a/src/etc/fricas b/src/etc/fricas
index 35a881d6..2fa42b85 100644
--- a/src/etc/fricas
+++ b/src/etc/fricas
@@ -135,7 +135,7 @@ fi

 if [ ! -f $FRICAS/bin/hypertex ]; then
     echo "hypertex  not present, disabling"
-    otheropts="-noht"
+    otheropts="$otheropts -noht"
 fi


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