diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index 3ef1cdfbe..a5e152c40 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -1567,6 +1567,7 @@ parallel computing platforms.  It also supports serial execution.")
          (add-after 'install 'make-wrapper
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let ((out (assoc-ref outputs "out")))
+               ;; 'qucs' directly invokes gcc, hence this wrapping.
                (wrap-program (string-append out "/bin/qucs")
                  `("CPLUS_INCLUDE_PATH" ":" prefix
                    (,(string-append (assoc-ref inputs "gcc-toolchain")
@@ -1598,7 +1599,7 @@ parallel computing platforms.  It also supports serial execution.")
        ("asco" ,asco)
        ("coreutils" ,coreutils)
        ("freehdl" ,freehdl)
-       ("gcc-toolchain" ,gcc-toolchain-5)
+       ("gcc-toolchain" ,gcc-toolchain)
        ("iverilog" ,iverilog)
        ("libtool" ,libtool)
        ("octave" ,octave)
@@ -1607,8 +1608,8 @@ parallel computing platforms.  It also supports serial execution.")
     (home-page "http://qucs.sourceforge.net/")
     (synopsis "Circuit simulator with graphical user interface")
     (description
-     "Qucs is a circuit simulator with graphical user interface.
-  The software aims to support all kinds of circuit simulation types,
-e.g. DC, AC, S-parameter, Transient, Noise and Harmonic Balance analysis.
-  Pure digital simulations are also supported.")
+     "Qucs is a circuit simulator with graphical user interface.  The software
+aims to support all kinds of circuit simulation types---e.g. DC, AC,
+S-parameter, transient, noise and harmonic balance analysis.  Pure digital
+simulations are also supported.")
     (license license:gpl2+)))