sci-libs/lmfit: fix pkgconfig and include/lib path

Closes: https://bugs.gentoo.org/981440
Signed-off-by: Alfredo Tupone <tupone@gentoo.org>

sci-libs/lmfit/files/lmfit-9.0-cmake.patch

@@ -1,12 +1,14 @@
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -1,4 +1,4 @@
+@@ -1,4 +1,6 @@
 -cmake_minimum_required(VERSION 3.6 FATAL_ERROR)
 +cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
  
++include(GNUInstallDirs)
++
  list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
  include(PreventInSourceBuilds)
-@@ -52,9 +52,10 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+@@ -52,7 +52,7 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
  set(destination ${CMAKE_INSTALL_PREFIX})
  configure_file("lmfit.pc.in" "lmfit.pc" @ONLY)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/lmfit.pc"
@@ -14,10 +16,7 @@
 +	DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig/")
  
  include(CTest)
-+include(GNUInstallDirs)
  
- add_subdirectory(lib)
- add_subdirectory(demo)
 --- a/lib/CMakeLists.txt
 +++ b/lib/CMakeLists.txt
 @@ -19,13 +19,13 @@ link_libm(${lib})
@@ -27,14 +26,14 @@
 -    LIBRARY DESTINATION ${destination}/lib
 -    RUNTIME DESTINATION ${destination}/lib
 -    ARCHIVE DESTINATION ${destination}/lib
-+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}/lib
-+    RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}/lib
-+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}/lib
++    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
++    RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}
++    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
      COMPONENT Libraries)
  install(
      FILES ${inc_files}
 -    DESTINATION ${destination}/include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
      COMPONENT Headers)
  
  if(WIN32)

sci-libs/lmfit/files/lmfit-9.0-pc.patch

@@ -0,0 +1,12 @@
+--- a/lmfit.pc.in	2026-10-23 22:39:09.245775330 +0200
++++ b/lmfit.pc.in	2026-10-23 22:39:56.992195999 +0200
+@@ -1,7 +1,7 @@
+ prefix=@destination@
+ exec_prefix=${prefix}
+-libdir=${prefix}/lib
+-includedir=${prefix}/include
++libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
++includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+ 
+ Name: lmfit
+ Description: Levenberg-Marquardt mean-squares minimization and curve fitting

sci-libs/lmfit/lmfit-9.0-r2.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -17,4 +17,5 @@ KEYWORDS="amd64 arm arm64 ~riscv ~x86"
 
 PATCHES=(
 	"${FILESDIR}"/${P}-cmake.patch
+	"${FILESDIR}"/${P}-pc.patch
 )