guile-git: fix libgit2 library path (0.5.2 rev 3)

Formula/guile-git.rb

@@ -3,20 +3,24 @@ class GuileGit < Formula
   homepage "https://gitlab.com/guile-git/guile-git"
   url "https://gitlab.com/guile-git/guile-git/uploads/6450f3991aa524484038cdcea3fb248d/guile-git-0.5.2.tar.gz"
   sha256 "949755a211ad6e905ecdebe66ca35bfaab638d985b9fadc928ad2538d8f5cc95"
-  revision 2
+  revision 3
 
   bottle do
     root_url "https://github.com/aconchillo/homebrew-guile/releases/download/guile-git-0.5.2_2"
     sha256 cellar: :any_skip_relocation, big_sur:      "de100ac6aefed86383b415f6e7d5453851d733cc3832a69d0e36d1991037a8f3"
     sha256 cellar: :any_skip_relocation, x86_64_linux: "263d075ede376a0f3438acac685979d67fcd0a2b02e30e213a2bc314ada26374"
   end
 
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
   depends_on "pkg-config" => :build
   depends_on "texinfo" => :build
   depends_on "guile"
   depends_on "guile-bytestructures"
   depends_on "libgit2"
 
+  patch :DATA
+
   def install
     ENV["GUILE_AUTO_COMPILE"] = "0"
 
@@ -25,6 +29,7 @@ def install
     ENV["GUILE_LOAD_COMPILED_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/site-ccache"
     ENV["GUILE_SYSTEM_EXTENSIONS_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/extensions"
 
+    system "autoreconf", "-vif"
     system "./configure", "--prefix=#{prefix}"
     system "make", "install"
   end
@@ -52,3 +57,64 @@ def caveats
     system "guile", git
   end
 end
+
+__END__
+diff --git a/configure.ac b/configure.ac
+index a6e2bd4..ac75b36 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -35,12 +35,36 @@ GUILE_MODULE_REQUIRED([srfi srfi-64])
+
+ GUILE_MODULE_REQUIRED([bytestructures guile])
+
+-PKG_CHECK_MODULES([LIBGIT2], [libgit2 >= 0.28.0])
+-PKG_CHECK_VAR([LIBGIT2_LIBDIR], [libgit2], [libdir])
+-AC_MSG_CHECKING([libgit2 library path])
+-AS_IF([test "x$LIBGIT2_LIBDIR" = "x"], [
+-  AC_MSG_FAILURE([Unable to identify libgit2 lib path.])
++AC_DEFUN([GUILE_LIBGIT2_FILE_NAME], [
++  AC_REQUIRE([PKG_PROG_PKG_CONFIG])
++  AC_CACHE_CHECK([libgit2's file name],
++    [guile_cv_libgit2_libdir],
++    [if test "$cross_compiling" = yes; then
++       # When cross-compiling, we cannot rely on 'ldd'.  Instead, look
++       # the output of 'ld --verbose', assuming we're using GNU ld.
++       echo 'int main () { return git_libgit2_init(); }' > conftest.c
++       guile_cv_libgit2_libdir="\
++          `$CC conftest.c -o conftest$EXEEXT -llz -Wl,--verbose 2>/dev/null \
++          | grep -E '^/.*/libgit2\.(a|so)'`"
++       rm -f conftest.c conftest$EXEEXT
++     else
++       old_LIBS="$LIBS"
++       LIBS="-lgit2"
++       AC_LINK_IFELSE([AC_LANG_SOURCE([int main () { return git_libgit2_init(); }])],
++	 [guile_cv_libgit2_libdir="`ldd conftest$EXEEXT | grep libgit2 | sed '-es/.*=> \(.*\) .*$/\1/g'`"])
++       LIBS="$old_LIBS"
++     fi])
++  $1="$guile_cv_libgit2_libdir"
+ ])
++
++dnl Library name of libgit2 suitable for 'dynamic-link'.
++GUILE_LIBGIT2_FILE_NAME([LIBGIT2_LIBDIR])
++if test "x$LIBGIT2_LIBDIR" = "x"; then
++  LIBGIT2_LIBDIR="libgit2"
++else
++  # Strip the .so or .so.1 extension since that's what 'dynamic-link' expects.
++  LIBGIT2_LIBDIR="`echo $LIBGIT2_LIBDIR | sed -es'/\.so\(\.[[0-9.]]\+\)\?//g'`"
++fi
+ AC_SUBST([LIBGIT2_LIBDIR])
+
+ AC_PROG_CC
+diff --git a/git/configuration.scm.in b/git/configuration.scm.in
+index dc7b1a9..a1c2a72 100644
+--- a/git/configuration.scm.in
++++ b/git/configuration.scm.in
+@@ -24,7 +24,7 @@
+             %have-fetch-options-follow-redirects?))
+
+ (define %libgit2
+-  "@LIBGIT2_LIBDIR@/libgit2")
++  "@LIBGIT2_LIBDIR@")
+
+ (define %have-remote-callbacks-resolve-url?
+   ;; True if the 'git_remote_callbacks' struct has a 'resolve_url' field.