gnu: calibre: Add optipng as an input.

* gnu/packages/ebook.scm (calibre)[inputs]: Add optipng.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

diff --git a/gnu/packages/ebook.scm b/gnu/packages/ebook.scm
index a8c6f59..659ec57 100644 (file)
--- a/gnu/packages/ebook.scm
+++ b/gnu/packages/ebook.scm
@@ -116,6 +116,7 @@
        ("libusb" ,libusb)
        ("libxrender" ,libxrender)
        ("openssl" ,openssl)
+       ("optipng" ,optipng)
        ("podofo" ,podofo)
        ("poppler" ,poppler)
        ("python" ,python-2)