configure: support PKG_CONFIG from env

pkg-config could be prefixed in some env.

Signed-off-by: Nicolas PARLANT <nicolas.parlant@parhuet.fr>

diff --git a/configure b/configure
index 7afd08c7dac7822b74cf3315b5ba6adacbdb1de7..b5634fbae5deee44e2b2450d73d8a3b2e348c9e2 100755 (executable)
--- a/configure
+++ b/configure
@@ -95,6 +95,7 @@ CPPFLAGS=${CPPFLAGS:-}
 CXXFLAGS_for_sh=${CXXFLAGS:-${CFLAGS}}
 CXXFLAGS=${CXXFLAGS:-\$(CFLAGS)}
 LDFLAGS=${LDFLAGS:-}
+PKG_CONFIG=${PKG_CONFIG:-pkg-config}
 XAPIAN_CONFIG=${XAPIAN_CONFIG:-}
 PYTHON=${PYTHON:-}
 RUBY=${RUBY:-ruby}
@@ -463,7 +464,7 @@ EOF
     exit 1
 fi
 
-if pkg-config --version > /dev/null 2>&1; then
+if ${PKG_CONFIG} --version > /dev/null 2>&1; then
     have_pkg_config=1
 else
     have_pkg_config=0
@@ -496,11 +497,11 @@ fi
 GMIME_MINVER=3.0.3
 
 printf "Checking for GMime development files (>= $GMIME_MINVER)... "
-if pkg-config --exists "gmime-3.0 >= $GMIME_MINVER"; then
+if ${PKG_CONFIG} --exists "gmime-3.0 >= $GMIME_MINVER"; then
     printf "Yes.\n"
     have_gmime=1
-    gmime_cflags=$(pkg-config --cflags gmime-3.0)
-    gmime_ldflags=$(pkg-config --libs gmime-3.0)
+    gmime_cflags=$(${PKG_CONFIG} --cflags gmime-3.0)
+    gmime_ldflags=$(${PKG_CONFIG} --libs gmime-3.0)
 
     printf "Checking for GMime session key extraction support... "
 
@@ -553,7 +554,7 @@ version of GPGME.
 Please try to rebuild your version of GMime against a more recent
 version of GPGME (at least GPGME 1.8.0).
 EOF
-       if GPGME_VERS="$(pkg-config --modversion gpgme || gpgme-config --version)"; then
+       if GPGME_VERS="$(${PKG_CONFIG} --modversion gpgme || gpgme-config --version)"; then
            printf 'Your current GPGME development version is: %s\n' "$GPGME_VERS"
        else
            printf 'You do not have the GPGME development libraries installed.\n'
@@ -627,7 +628,7 @@ EOF
        else
            gmime_x509_cert_validity=0
            printf "No.\n"
-           if pkg-config --exists "gmime-3.0 >= 3.2.7"; then
+           if ${PKG_CONFIG} --exists "gmime-3.0 >= 3.2.7"; then
                cat <<EOF
 *** Error: GMime fails to calculate X.509 certificate validity, and
 is later than 3.2.7, which should have fixed this issue.
@@ -736,7 +737,7 @@ fi
 # function that only exists as of 2.22, (g_array_unref)
 printf "Checking for Glib development files (>= 2.22)... "
 have_glib=0
-if pkg-config --exists 'glib-2.0 >= 2.22'; then
+if ${PKG_CONFIG} --exists 'glib-2.0 >= 2.22'; then
     printf "Yes.\n"
     have_glib=1
     # these are included in gmime cflags and ldflags
@@ -747,7 +748,7 @@ else
     errors=$((errors + 1))
 fi
 
-if ! pkg-config --exists zlib; then
+if ! ${PKG_CONFIG} --exists zlib; then
   ${CC} -o compat/gen_zlib_pc "$srcdir"/compat/gen_zlib_pc.c >/dev/null 2>&1 &&
   compat/gen_zlib_pc > compat/zlib.pc &&
   PKG_CONFIG_PATH=${PKG_CONFIG_PATH:+$PKG_CONFIG_PATH:}compat &&
@@ -757,22 +758,22 @@ fi
 
 printf "Checking for zlib (>= 1.2.5.2)... "
 have_zlib=0
-if pkg-config --atleast-version=1.2.5.2 zlib; then
+if ${PKG_CONFIG} --atleast-version=1.2.5.2 zlib; then
     printf "Yes.\n"
     have_zlib=1
-    zlib_cflags=$(pkg-config --cflags zlib)
-    zlib_ldflags=$(pkg-config --libs zlib)
+    zlib_cflags=$(${PKG_CONFIG} --cflags zlib)
+    zlib_ldflags=$(${PKG_CONFIG} --libs zlib)
 else
     printf "No.\n"
     errors=$((errors + 1))
 fi
 
 printf "Checking for talloc development files... "
-if pkg-config --exists talloc; then
+if ${PKG_CONFIG} --exists talloc; then
     printf "Yes.\n"
     have_talloc=1
-    talloc_cflags=$(pkg-config --cflags talloc)
-    talloc_ldflags=$(pkg-config --libs talloc)
+    talloc_cflags=$(${PKG_CONFIG} --cflags talloc)
+    talloc_ldflags=$(${PKG_CONFIG} --libs talloc)
 else
     printf "No.\n"
     have_talloc=0
@@ -837,7 +838,7 @@ if [ $have_python3 -eq 1 ]; then
     printf "(%s)\n" $python3_version
 
     printf "Checking for python $python3_version development files..."
-    if pkg-config --exists "python-$python3_version"; then
+    if ${PKG_CONFIG} --exists "python-$python3_version"; then
        have_python3_dev=1
        printf "Yes.\n"
     else
@@ -873,10 +874,10 @@ if [ $have_python3_dev -eq 1 ]; then
 fi
 
 printf "Checking for valgrind development files... "
-if pkg-config --exists valgrind; then
+if ${PKG_CONFIG} --exists valgrind; then
     printf "Yes.\n"
     have_valgrind=1
-    valgrind_cflags=$(pkg-config --cflags valgrind)
+    valgrind_cflags=$(${PKG_CONFIG} --cflags valgrind)
 else
     printf "No (but that's fine).\n"
     have_valgrind=0
@@ -884,7 +885,7 @@ else
 fi
 
 printf "Checking for bash-completion (>= 1.90)... "
-if pkg-config --atleast-version=1.90 bash-completion; then
+if ${PKG_CONFIG} --atleast-version=1.90 bash-completion; then
     printf "Yes.\n"
 else
     printf "No (will not install bash completion).\n"
@@ -892,11 +893,11 @@ else
 fi
 
 printf "Checking for sfsexp... "
-if pkg-config --exists sfsexp; then
+if ${PKG_CONFIG} --exists sfsexp; then
     printf "Yes.\n"
     have_sfsexp=1
-    sfsexp_cflags=$(pkg-config --cflags sfsexp)
-    sfsexp_ldflags=$(pkg-config --libs sfsexp)
+    sfsexp_cflags=$(${PKG_CONFIG} --cflags sfsexp)
+    sfsexp_ldflags=$(${PKG_CONFIG} --libs sfsexp)
 else
     printf "No (will not enable s-expression queries).\n"
     have_sfsexp=0