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The Requires.private line in the pkgconfig file seems to be erroneous according to the pkg-config specifications. Both Requires and Requires.private should list names of pkg-config modules and not refer to flags directly, whereas -pthread looks more appropriate for Libs.private. Indeed on my system (openSUSE Tumbleweed) there does not seem to be any pkg-config module by the name of -pthread (or even pthread) installed even though PTL can find pthread.h when building and link against it just fine (glibc-devel provides the pthread header).
Please let me know if I am wrong here; if not, here is a straightforward patch which I can make a PR with if you wish:
Index: PTL-2.2.0/cmake/Templates/ptl.pc.in
===================================================================
--- PTL-2.2.0.orig/cmake/Templates/ptl.pc.in
+++ PTL-2.2.0/cmake/Templates/ptl.pc.in
@@ -6,6 +6,6 @@ Name: PTL
Description: Parallel Tasking Library for C++
Version: @PTL_VERSION_STRING@
Requires: @PTL_PC_TBB_REQUIREMENT@
-Requires.private: -pthread
Libs: -L${libdir} -lptl
+Libs.private: -pthread
CFlags: -std=c++@CMAKE_CXX_STANDARD@ -pthread -I${includedir}Many thanks for your library btw.
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