diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index 2a7dfe470f..3c1f6a98f3 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -2481,7 +2481,19 @@ full programmatic control over your models.")
        (list
         "-DBUILD_QT5=ON"
         (string-append "-DCMAKE_INSTALL_LIBDIR="
-                       (assoc-ref %outputs "out") "/lib"))
+                       (assoc-ref %outputs "out") "/lib")
+        (string-append "-DPYSIDE2UICBINARY="
+                       (assoc-ref %build-inputs "python-pyside-2-tools")
+                       "/bin/uic")
+        (string-append "-DPYSIDE2RCCBINARY="
+                       (assoc-ref %build-inputs "python-pyside-2-tools")
+                       "/bin/rcc")
+        (string-append "-DPYSIDE_INCLUDE_DIR="
+                       (assoc-ref %build-inputs "python-pyside-2")
+                       "/include")
+        (string-append "-DSHIBOKEN_INCLUDE_DIR="
+                       (assoc-ref %build-inputs "python-shiboken-2")
+                       "/include"))
        #:phases
        (modify-phases %standard-phases
          (add-before 'configure 'restore-pythonpath