Based on
configure.ac: Use python3-embed.pc as a fallback
https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commit;h=a6a5e2c8b0e9ecf5d69d0c237c8e8b717b82b36f

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -93,7 +93,7 @@ SR_PKG_CHECK_SUMMARY([srd_pkglibs_summary])
 # first, since usually only that variant will add "-lpython3.8".
 # https://docs.python.org/3/whatsnew/3.8.html#debug-build-uses-the-same-abi-as-release-build
 SR_PKG_CHECK([python3], [SRD_PKGLIBS],
-	[python-3.8-embed], [python-3.8 >= 3.8], [python-3.7 >= 3.7], [python-3.6 >= 3.6], [python-3.5 >= 3.5], [python-3.4 >= 3.4], [python-3.3 >= 3.3], [python-3.2 >= 3.2], [python3 >= 3.2])
+	[python-3.8-embed], [python3-embed], [python-3.8 >= 3.8], [python-3.7 >= 3.7], [python-3.6 >= 3.6], [python-3.5 >= 3.5], [python-3.4 >= 3.4], [python-3.3 >= 3.3], [python-3.2 >= 3.2], [python3 >= 3.2])
 AS_IF([test "x$sr_have_python3" = xno],
 	[AC_MSG_ERROR([Cannot find Python 3 development headers.])])
 
