diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 1666d6e420..837d055c8e 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -8457,7 +8457,7 @@ (define-public optizelle
 (define-public scilab
   (package
     (name "scilab")
-    (version "5.5.2")
+    (version "6.1.1")
     (source
      (origin
        (method url-fetch)
@@ -8465,9 +8465,9 @@ (define-public scilab
         (string-append "https://www.scilab.org/download/"
                        version "/scilab-" version "-src.tar.gz"))
        (sha256
-        (base32 "0phg9pn24yw98hbh475ik84dnikf1225b2knh7qbhdbdx6fm2d57"))))
+        (base32 "01s28d162znwl7na0qlclzmfg6h7kwgmly1hr5vc51fkidilf4z5"))))
     (build-system gnu-build-system)
-    (native-inputs (list pkg-config gfortran))
+    (native-inputs (list pkg-config gfortran eigen))
     (inputs (list libxml2
                   `(,pcre "bin")
                   `(,pcre "out")
@@ -8495,7 +8495,9 @@ (define-public scilab
            "--without-javasci"
            "--disable-build-help"
            "--with-external-scirenderer"
-           ;; Tcl and Tk library locations.
+           ;; Disable the Scicos modelica compiler, which requires ocamlc.
+           "--without-modelica"
+           ;; Header and library locations.
            (string-append "--with-tcl-include="
                           (string-drop-right
                            (search-input-file %build-inputs "include/tcl.h")
@@ -8512,6 +8514,10 @@ (define-public scilab
                           (string-drop-right
                            (search-input-directory %build-inputs "lib/tk8.6")
                            (string-length "/tk8.6")))
+           (string-append "--with-eigen-include="
+                          (string-drop-right
+                           (search-input-file %build-inputs "include/eigen3/Eigen/Sparse")
+                           (string-length "/Eigen/Sparse")))
            ;; There are some 2018-fortran errors that are ignored
            ;; with this fortran compiler flag.
            "FFLAGS=-fallow-argument-mismatch")
@@ -8538,6 +8544,9 @@ (define-public scilab
                   (("(H5Rdereference\\(_iDatasetId, H5R_OBJECT, )&(.*)\\);$"
                     all common ref)
                    (string-append common ref)))
+                (substitute* "modules/string/includes/os_string.h"
+                  (("#include <string.h>")
+                   "#include <strings.h>"))
                 ;; fix multiple definitions
                 (substitute* "modules/tclsci/src/c/TCL_Command.h"
                   (("^__thread")
@@ -8562,4 +8571,4 @@ (define-public scilab
 statistical analysis, image enhancement, fluid dynamics simulations, numerical
 optimization, and modeling, simulation of explicit and implicit dynamical
 systems and symbolic manipulations.")
-    (license license:cecill)))                    ;CeCILL v2.1
+    (license license:gpl2+)))