diff --git a/cli/main.c b/cli/main.c
index 4b63fa9..5faf0dc 100644
--- a/cli/main.c
+++ b/cli/main.c
@@ -1018,6 +1018,9 @@ main(int argc, char *argv[])
 	if (getenv("PKG_CONFIG_FDO_SYSROOT_RULES"))
 		want_client_flags |= PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES;
 
+	if (getenv("PKG_CONFIG_PKGCONF1_SYSROOT_RULES"))
+		want_client_flags |= PKGCONF_PKG_PKGF_PKGCONF1_SYSROOT_RULES;
+
 	if ((want_flags & PKG_SHORT_ERRORS) == PKG_SHORT_ERRORS)
 		want_client_flags |= PKGCONF_PKG_PKGF_SIMPLIFY_ERRORS;
 
diff --git a/libpkgconf/fragment.c b/libpkgconf/fragment.c
index 9a618c8..32efa64 100644
--- a/libpkgconf/fragment.c
+++ b/libpkgconf/fragment.c
@@ -93,15 +93,18 @@ pkgconf_fragment_is_special(const char *string)
 }
 
 static inline void
-pkgconf_fragment_munge(const pkgconf_client_t *client, char *buf, size_t buflen, const char *source, const char *sysroot_dir)
+pkgconf_fragment_munge(const pkgconf_client_t *client, char *buf, size_t buflen, const char *source, const char *sysroot_dir, unsigned int flags)
 {
 	*buf = '\0';
 
-	if (sysroot_dir == NULL)
-		sysroot_dir = pkgconf_tuple_find_global(client, "pc_sysrootdir");
+	if (!(flags & PKGCONF_PKG_PROPF_UNINSTALLED) || (client->flags & PKGCONF_PKG_PKGF_PKGCONF1_SYSROOT_RULES))
+	{
+		if (sysroot_dir == NULL)
+			sysroot_dir = pkgconf_tuple_find_global(client, "pc_sysrootdir");
 
-	if (sysroot_dir != NULL && pkgconf_fragment_should_munge(source, sysroot_dir))
-		pkgconf_strlcat(buf, sysroot_dir, buflen);
+		if (sysroot_dir != NULL && pkgconf_fragment_should_munge(source, sysroot_dir))
+			pkgconf_strlcat(buf, sysroot_dir, buflen);
+	}
 
 	pkgconf_strlcat(buf, source, buflen);
 
@@ -110,27 +113,28 @@ pkgconf_fragment_munge(const pkgconf_client_t *client, char *buf, size_t buflen,
 }
 
 static inline char *
-pkgconf_fragment_copy_munged(const pkgconf_client_t *client, const char *source)
+pkgconf_fragment_copy_munged(const pkgconf_client_t *client, const char *source, unsigned int flags)
 {
 	char mungebuf[PKGCONF_ITEM_SIZE];
-	pkgconf_fragment_munge(client, mungebuf, sizeof mungebuf, source, client->sysroot_dir);
+	pkgconf_fragment_munge(client, mungebuf, sizeof mungebuf, source, client->sysroot_dir, flags);
 	return strdup(mungebuf);
 }
 
 /*
  * !doc
  *
- * .. c:function:: void pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string)
+ * .. c:function:: void pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string, unsigned int flags)
  *
  *    Adds a `fragment` of text to a `fragment list`, possibly modifying the fragment if a sysroot is set.
  *
  *    :param pkgconf_client_t* client: The pkgconf client being accessed.
  *    :param pkgconf_list_t* list: The fragment list.
  *    :param char* string: The string of text to add as a fragment to the fragment list.
+ *    :param uint flags: Parsing-related flags for the package.
  *    :return: nothing
  */
 void
-pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string)
+pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string, unsigned int flags)
 {
 	pkgconf_fragment_t *frag;
 
@@ -142,7 +146,7 @@ pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const
 		frag = calloc(sizeof(pkgconf_fragment_t), 1);
 
 		frag->type = *(string + 1);
-		frag->data = pkgconf_fragment_copy_munged(client, string + 2);
+		frag->data = pkgconf_fragment_copy_munged(client, string + 2, flags);
 
 		PKGCONF_TRACE(client, "added fragment {%c, '%s'} to list @%p", frag->type, frag->data, list);
 	}
@@ -161,7 +165,7 @@ pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const
 				size_t len;
 				char *newdata;
 
-				pkgconf_fragment_munge(client, mungebuf, sizeof mungebuf, string, NULL);
+				pkgconf_fragment_munge(client, mungebuf, sizeof mungebuf, string, NULL, flags);
 
 				len = strlen(parent->data) + strlen(mungebuf) + 2;
 				newdata = malloc(len);
@@ -686,6 +690,8 @@ pkgconf_fragment_parse(const pkgconf_client_t *client, pkgconf_list_t *list, pkg
 
 	for (i = 0; i < argc; i++)
 	{
+		PKGCONF_TRACE(client, "processing %s", argv[i]);
+
 		if (argv[i] == NULL)
 		{
 			PKGCONF_TRACE(client, "parsed fragment string is inconsistent: argc = %d while argv[%d] == NULL", argc, i);
@@ -694,7 +700,7 @@ pkgconf_fragment_parse(const pkgconf_client_t *client, pkgconf_list_t *list, pkg
 			return false;
 		}
 
-		pkgconf_fragment_add(client, list, argv[i]);
+		pkgconf_fragment_add(client, list, argv[i], flags);
 	}
 
 	pkgconf_argv_free(argv);
diff --git a/libpkgconf/libpkgconf.h b/libpkgconf/libpkgconf.h
index c6cd901..59fa45f 100644
--- a/libpkgconf/libpkgconf.h
+++ b/libpkgconf/libpkgconf.h
@@ -262,6 +262,7 @@ PKGCONF_API void pkgconf_cross_personality_deinit(pkgconf_cross_personality_t *p
 #define PKGCONF_PKG_PKGF_DONT_FILTER_INTERNAL_CFLAGS	0x2000
 #define PKGCONF_PKG_PKGF_DONT_MERGE_SPECIAL_FRAGMENTS	0x4000
 #define PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES		0x8000
+#define PKGCONF_PKG_PKGF_PKGCONF1_SYSROOT_RULES         0x10000
 
 #define PKGCONF_PKG_DEPF_INTERNAL		0x1
 
@@ -347,7 +348,7 @@ typedef struct pkgconf_fragment_render_ops_ {
 
 typedef bool (*pkgconf_fragment_filter_func_t)(const pkgconf_client_t *client, const pkgconf_fragment_t *frag, void *data);
 PKGCONF_API bool pkgconf_fragment_parse(const pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_list_t *vars, const char *value, unsigned int flags);
-PKGCONF_API void pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string);
+PKGCONF_API void pkgconf_fragment_add(const pkgconf_client_t *client, pkgconf_list_t *list, const char *string, unsigned int flags);
 PKGCONF_API void pkgconf_fragment_copy(const pkgconf_client_t *client, pkgconf_list_t *list, const pkgconf_fragment_t *base, bool is_private);
 PKGCONF_API void pkgconf_fragment_copy_list(const pkgconf_client_t *client, pkgconf_list_t *list, const pkgconf_list_t *base);
 PKGCONF_API void pkgconf_fragment_delete(pkgconf_list_t *list, pkgconf_fragment_t *node);
diff --git a/libpkgconf/tuple.c b/libpkgconf/tuple.c
index cf0103e..ea32b40 100644
--- a/libpkgconf/tuple.c
+++ b/libpkgconf/tuple.c
@@ -225,14 +225,14 @@ pkgconf_tuple_add(const pkgconf_client_t *client, pkgconf_list_t *list, const ch
 
 	dequote_value = dequote(value);
 
-	PKGCONF_TRACE(client, "adding tuple to @%p: %s => %s (parsed? %d)", list, key, dequote_value, parse);
-
 	tuple->key = strdup(key);
 	if (parse)
 		tuple->value = pkgconf_tuple_parse(client, list, dequote_value, flags);
 	else
 		tuple->value = strdup(dequote_value);
 
+	PKGCONF_TRACE(client, "adding tuple to @%p: %s => %s (parsed? %d)", list, key, tuple->value, parse);
+
 	pkgconf_node_insert(&tuple->iter, tuple, list);
 
 	free(dequote_value);
@@ -290,7 +290,8 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
 	const char *ptr;
 	char *bptr = buf;
 
-	if (!(client->flags & PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES))
+	if (!(client->flags & PKGCONF_PKG_PKGF_FDO_SYSROOT_RULES) &&
+		(!(flags & PKGCONF_PKG_PROPF_UNINSTALLED) || (client->flags & PKGCONF_PKG_PKGF_PKGCONF1_SYSROOT_RULES)))
 	{
 		if (*value == '/' && client->sysroot_dir != NULL && strncmp(value, client->sysroot_dir, strlen(client->sysroot_dir)))
 			bptr += pkgconf_strlcpy(buf, client->sysroot_dir, sizeof buf);
@@ -329,6 +330,8 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
 				}
 			}
 
+			PKGCONF_TRACE(client, "lookup tuple %s", varname);
+
 			ptr += (pptr - ptr);
 			kv = pkgconf_tuple_find_global(client, varname);
 			if (kv != NULL)
diff --git a/tests/sysroot.sh b/tests/sysroot.sh
index 2d72448..6e9ce01 100755
--- a/tests/sysroot.sh
+++ b/tests/sysroot.sh
@@ -8,6 +8,7 @@ tests_init \
 	do_not_eat_slash \
 	do_not_duplicate_sysroot_dir \
 	uninstalled \
+	uninstalled_pkgconf1 \
 	uninstalled_fdo
 
 do_not_eat_slash_body()
@@ -70,7 +71,18 @@ uninstalled_body()
 	export PKG_CONFIG_SYSROOT_DIR="/sysroot"
 
 	atf_check \
-		-o inline:"-lomg \n" \
+		-o inline:"-L/test/lib -lomg \n" \
+		pkgconf --libs omg
+}
+
+uninstalled_pkgconf1_body()
+{
+	export PKG_CONFIG_PATH="${selfdir}/lib1"
+	export PKG_CONFIG_SYSROOT_DIR="/sysroot"
+	export PKG_CONFIG_PKGCONF1_SYSROOT_RULES="1"
+
+	atf_check \
+		-o inline:"-L/sysroot/test/lib -lomg \n" \
 		pkgconf --libs omg
 }
 
@@ -81,6 +93,6 @@ uninstalled_fdo_body()
 	export PKG_CONFIG_FDO_SYSROOT_RULES="1"
 
 	atf_check \
-		-o inline:"-L/sysroot/test/lib -lomg \n" \
+		-o inline:"-L/test/lib -lomg \n" \
 		pkgconf --libs omg
 }