Why do I receive a PKIX error when installing the RTL-SDR Support Package?

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MathWorks Support Team
编辑： MathWorks Support Team 2021-5-19
I have a MATLAB R2016a installed on my Mac running macOS 10.11.4. When I try to install the RTL-SDR Support Package, why do I encounter this error in the Support Package Installer window:
ERROR: Download Failed: sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

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MathWorks Support Team
编辑：MathWorks Support Team 2021-5-19
The Java version that MATLAB uses does not recognize the SSL Certificate Authority for the https://www.freedesktop.org/wiki/Software/pkg-config/  website as a legitimate Certificate Authority.
However, the pkg-config source code can still be downloaded using a web browser (e.g. Safari). The following workaround will let you download and install the RTL-SDR Support Package successfully.
For
MATLAB R2016a
, follow these steps:
  1. Go through all steps for installing the RTL-SDR Support Package until getting the error message mentioned.
  2. In Documents/MATLAB/SupportPackages/R201xx/downloads/rtlsdrradio_download, a few xml files should now appear.
  3. Find the file whose name starts with pkgconfig_version_maci64.xml. The file to be downloaded is specified between xml tags "downloadUrl" ... "/downloadUrl" in the xml file.
  4. Download pkg-config manually using a web browser from https://www.freedesktop.org/wiki/Software/pkg-config/ .
  5. Save the .gz file in Documents/MATLAB/SupportPackages/R201xx/downloads/rtlsdrradio_download.
  6. Redo step 1.
For MATLAB R2016b, follow these steps:
  1. Go through all steps for installing the RTL-SDR Support Package until getting the error message mentioned.
  2. In Documents/MATLAB/SupportPackages/R201xx/downloads/rtlsdrradio_download, a few xml files should now appear.
  3. Find the file whose name starts with pkgconfig_version_maci64.xml. The file to be downloaded is specified between xml tags "downloadUrl" ... "/downloadUrl" in the xml file.
  4. Download pkg-config manually using a web browser from http://downloads.sourceforge.net/project/pkgconfiglite/0.28-1/pkg-config-lite-0.28-1.tar.gz.
  5. Save the .gz file in Documents/MATLAB/SupportPackages/R201xx/downloads/rtlsdrradio_download.
  6. Redo step 1.
These steps should resolve the issue.

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