diff '--color=auto' -urN udis86/configure.ac udis86-patched/configure.ac
--- udis86/configure.ac	2023-05-14 11:29:29.277981651 +0300
+++ udis86-patched/configure.ac	2023-05-14 15:29:36.013942865 +0300
@@ -69,6 +69,7 @@
 AC_CHECK_HEADERS([assert.h stdio.h])
 
 AC_CONFIG_FILES([
+    udis86.pc
     Makefile
     scripts/Makefile
     libudis86/Makefile
diff '--color=auto' -urN udis86/Makefile.am udis86-patched/Makefile.am
--- udis86/Makefile.am	2023-05-14 11:29:29.246981437 +0300
+++ udis86-patched/Makefile.am	2023-05-14 15:28:47.335628559 +0300
@@ -19,6 +19,13 @@
     build/ltmain.sh \
     build/missing
 
+pcfiles = udis86.pc
+
+all-local: $(pcfiles)
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = $(pcfiles)
+
 include_ladir = ${includedir}
 include_la_HEADERS = udis86.h
 
diff '--color=auto' -urN udis86/udis86.pc.in udis86-patched/udis86.pc.in
--- udis86/udis86.pc.in	1970-01-01 03:00:00.000000000 +0300
+++ udis86-patched/udis86.pc.in	2023-05-14 15:30:20.073227346 +0300
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: udis86
+Description: udis86
+Version: @VERSION@
+Libs: -L${libdir} -ludis86
+Cflags: -I${includedir}
\ В конце файла нет новой строки