Richard Koch

Mathematics Department

University of Oregon



TeXShop is a Tex previewer for Mac OS X. For more information, click on The link below downloads a "LocalTeX" preference pane. This pane is a complement to the "TeX Dist" preference pane installed by MacTeX, which allows a user to select the active TeX distribution. The local pane allows individual users to override the choice made for all users by the TeX Dist pane, and to select distributions installed on a thumb drive, external hard disk, or home directory. It does not modify any data used by the TeX Dist pane and works on Mavericks and above. The download includes the LocalTeX pane, documentation, and full source code. Ghostscript 9.54.0 was released April 1, 2021, just as we were releasing TeX Live 2021 and MacTeX-2021. Although MacTeX-2021 contains the tested version 9.53.3, the new version seems to work fine with it. The package has universal Intel and Arm binaries and works on macOS Mojave and above. In case of trouble, revert back to Ghostscript 9.53.3.

Ghostscript 9.54 has OCR, Optical Character Recognition. Thus you can scan a page of a book, load the scan into Apple's Preview, and save as a pdf. Ghostscript 9.54 will convert this pdf file into a second pdf file which looks like the first one (in examples I tried, the two images were identical, fonts and all). Since the scan is just a large bitmap, trying to select text in it selects one gigantic box. But in the OCR copy, words and lines of text can be selected and copied. Click here for an example and specific instructions on using OCR.

Ghostscript 9.53.3 was released October 1, 2020. It fixes a couple of bugs in version 9.53.1, released on September 14, 2020, and in version 9.53.2, released September 25, 2020. Below is a signed and notarized Macintosh install package for this version of Ghostscript. The package has universal Intel and Arm binaries and works on macOS High Sierra and above. In case of trouble, you can revert to Ghostscript 9.50 by just installing on top of Ghostscript 9.53.3. This version fixes the "transparency bug" which impacted some TeX users. Ghostscript 9.50 was released October 15, 2019. Below is a signed and notarized Macintosh install package for this version of Ghostscript. The package works on macOS High Sierra and above, for Intel. In case of trouble, you can revert to Ghostscript 9.27 by just installing on top of Ghostscript 9.50. The version of the package linked below was released on December 22, 2019; the new version has a Custom mode which can also install the ghostscript library libgs.dylib in /usr/local/lib. This library is required by dvisvgm to enable certain operations, but most users will not need to install it. Ghostscript 9.27 was released April 4, 2019. Below is a signed and notarized Macintosh install package for this version of Ghostscript. The package works on macOS Sierra and above, for Intel. In case of trouble, you can revert to Ghostscript 9.26 by just installing on top of Ghostscript 9.27. Ghostscript 9.26 was released November 20, 2018. Below is a Macintosh install package for this version of Ghostscript. The package works on macOS Yosemite and above, for Intel. Ghostscript 9.20 was released September 26, 2016. Below is a Macintosh install package for Ghostscript 9.20. The package works on macOS Leopard and above for Intel. The PPC processor is not supported. Ghostscript 9.19 was released March 23, 2016. Below is a Macintosh install package for Ghostscript 9.19. The package works on both PPC and Intel, for Leopard and above. Minimal TeX is a very small distribution of TeX for the Macintosh. It only contains engines for Plain TeX and variants of Plain TeX, but nothing about LaTeX. It is based on the TeX Live "minimal scheme" for 2021. Here is an install package for the Macintosh.


Below are longer articles about topics which interest me: Below are the slides from a talk given at Humboldt State University in 2015 You may also want to access: Notes from a lecture at Bend: I recently taught Two other small Cocoa programs for Mac OS X are available:


Richard Koch
2740 Washington St
Eugene OR 97405

Phone: (541)686-8466
Email: < koch@uoregon.edu >